diff --git a/client/tests/fixtures/msgpack/snapshot_boundary_tick_0.msgpack b/client/tests/fixtures/msgpack/snapshot_boundary_tick_0.msgpack
index 1615131dc..ac38bc05a 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_boundary_tick_0.msgpack and b/client/tests/fixtures/msgpack/snapshot_boundary_tick_0.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_boundary_tick_127.msgpack b/client/tests/fixtures/msgpack/snapshot_boundary_tick_127.msgpack
index 2d4321df5..f1662c717 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_boundary_tick_127.msgpack and b/client/tests/fixtures/msgpack/snapshot_boundary_tick_127.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b31m1.msgpack b/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b31m1.msgpack
index 4a8702760..08d570faa 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b31m1.msgpack and b/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b31m1.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b32.msgpack b/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b32.msgpack
index a1c311896..fab1ca162 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b32.msgpack and b/client/tests/fixtures/msgpack/snapshot_boundary_tick_2b32.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_boundary_tick_32767.msgpack b/client/tests/fixtures/msgpack/snapshot_boundary_tick_32767.msgpack
index 47762a0df..c57e8bab3 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_boundary_tick_32767.msgpack and b/client/tests/fixtures/msgpack/snapshot_boundary_tick_32767.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_empty.msgpack b/client/tests/fixtures/msgpack/snapshot_empty.msgpack
index 1615131dc..ac38bc05a 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_empty.msgpack and b/client/tests/fixtures/msgpack/snapshot_empty.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_full.msgpack b/client/tests/fixtures/msgpack/snapshot_full.msgpack
index d2f5bbd60..d9685c443 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_full.msgpack and b/client/tests/fixtures/msgpack/snapshot_full.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_minimal.msgpack b/client/tests/fixtures/msgpack/snapshot_minimal.msgpack
index fba288bb8..51ec3a8d0 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_minimal.msgpack and b/client/tests/fixtures/msgpack/snapshot_minimal.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_multi_entity.msgpack b/client/tests/fixtures/msgpack/snapshot_multi_entity.msgpack
index dc2acf96a..1c4e1bed3 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_multi_entity.msgpack and b/client/tests/fixtures/msgpack/snapshot_multi_entity.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_one_npc.msgpack b/client/tests/fixtures/msgpack/snapshot_one_npc.msgpack
index 107389317..759b09da2 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_one_npc.msgpack and b/client/tests/fixtures/msgpack/snapshot_one_npc.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_player.msgpack b/client/tests/fixtures/msgpack/snapshot_player.msgpack
index 8166124b0..21707cd91 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_player.msgpack and b/client/tests/fixtures/msgpack/snapshot_player.msgpack differ
diff --git a/client/tests/fixtures/msgpack/snapshot_v2_full.msgpack b/client/tests/fixtures/msgpack/snapshot_v2_full.msgpack
index f83ad4838..6c932af3d 100644
Binary files a/client/tests/fixtures/msgpack/snapshot_v2_full.msgpack and b/client/tests/fixtures/msgpack/snapshot_v2_full.msgpack differ
diff --git a/server/Cargo.lock b/server/Cargo.lock
index d469ae4e2..e6cdd0d5b 100644
--- a/server/Cargo.lock
+++ b/server/Cargo.lock
@@ -1092,7 +1092,7 @@ dependencies = [
 
 [[package]]
 name = "settled-reach-server"
-version = "0.1.20"
+version = "0.1.22"
 dependencies = [
  "bevy_app",
  "bevy_ecs",
diff --git a/server/tests/bridge_ipc.rs b/server/tests/bridge_ipc.rs
index 55275814c..ce61862c2 100644
--- a/server/tests/bridge_ipc.rs
+++ b/server/tests/bridge_ipc.rs
@@ -74,6 +74,7 @@ fn snapshot_roundtrip_over_unix_socket() {
             save_result: None,
             triangle_crisis_events: vec![],
             state_hash: None,
+        debug_response: None,
             sim_errors: vec![],
         };
 
diff --git a/server/tests/bridge_tcp.rs b/server/tests/bridge_tcp.rs
index 75ad29a3d..a07fe204b 100644
--- a/server/tests/bridge_tcp.rs
+++ b/server/tests/bridge_tcp.rs
@@ -60,6 +60,7 @@ fn snapshot_roundtrip_over_tcp() {
             save_result: None,
             triangle_crisis_events: vec![],
             state_hash: None,
+        debug_response: None,
             sim_errors: vec![],
         };
 
diff --git a/server/tests/error_handling.rs b/server/tests/error_handling.rs
index 78ec5bc07..a6ec3f409 100644
--- a/server/tests/error_handling.rs
+++ b/server/tests/error_handling.rs
@@ -295,6 +295,7 @@ fn snapshot_with_sim_errors_roundtrips() {
         save_result: None,
         triangle_crisis_events: vec![],
         state_hash: Some(0xDEADBEEF),
+        debug_response: None,
         sim_errors: vec![
             SimError {
                 kind: SimErrorKind::ProtocolError,
diff --git a/server/tests/gen_fixtures.rs b/server/tests/gen_fixtures.rs
index 3582b4398..765409f1d 100644
--- a/server/tests/gen_fixtures.rs
+++ b/server/tests/gen_fixtures.rs
@@ -50,6 +50,7 @@ fn fixture_snapshot(tick: u64, entities: Vec<VisibleEntity>) -> ObserverSnapshot
         save_result: None,
         triangle_crisis_events: vec![],
         state_hash: None,
+        debug_response: None,
         sim_errors: vec![],
     }
 }
@@ -244,6 +245,7 @@ fn generate_msgpack_fixtures() {
         save_result: None,
         triangle_crisis_events: vec![],
         state_hash: None,
+        debug_response: None,
         sim_errors: vec![],
     };
     write_fixture(
@@ -408,6 +410,7 @@ fn generate_msgpack_fixtures() {
         }),
         triangle_crisis_events: vec![],
         state_hash: None,
+        debug_response: None,
         sim_errors: vec![],
     };
     write_fixture(
diff --git a/server/tests/golden/proof_room_tick_10.json b/server/tests/golden/proof_room_tick_10.json
index 8d0803fd8..a11e8c138 100644
--- a/server/tests/golden/proof_room_tick_10.json
+++ b/server/tests/golden/proof_room_tick_10.json
@@ -40,38 +40,255 @@
   "state_hash": 14452262397297540338,
   "tick": 8,
   "triangle_crisis_events": [],
-  "version": 17,
+  "version": 18,
   "visible_tiles": [
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -3,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -2,
+      "y": 2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": -1,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": -1,
       "y": -1,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": -1,
       "y": 0,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": -1,
       "y": 1,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": -1,
       "y": 2,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 0,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 0,
       "y": -1,
@@ -106,7 +323,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 1,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 1,
       "y": -1,
@@ -141,7 +400,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 2,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 2,
       "y": -1,
@@ -183,7 +484,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 3,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 3,
       "y": -1,
@@ -225,7 +568,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 4,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 4,
       "y": -1,
@@ -274,7 +659,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 5,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 5,
       "y": -1,
@@ -330,7 +757,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 6,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 6,
       "y": -1,
@@ -386,7 +855,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 7,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 7,
       "y": -1,
@@ -449,7 +960,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 8,
+      "y": -2,
+      "z": 0
+    },
+    {
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       "visibility": "Forward",
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       "y": -1,
@@ -512,7 +1065,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+    },
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+      "tile_kind": "Floor",
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+    {
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+    },
+    {
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+    },
+    {
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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@@ -582,7 +1177,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+    },
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+      "tile_kind": "Floor",
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+    {
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+    },
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+    },
+    {
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+      "visibility": "Forward",
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+      "y": -3,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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@@ -652,7 +1289,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -3,
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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       "y": -1,
@@ -729,7 +1408,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -4,
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -3,
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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       "y": -1,
@@ -813,7 +1534,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+    },
+    {
+      "tile_kind": "Floor",
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+    {
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+    },
+    {
+      "tile_kind": "Floor",
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+    },
+    {
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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       "y": -1,
@@ -897,7 +1660,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+    },
+    {
+      "tile_kind": "Floor",
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+    },
+    {
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -4,
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+    {
+      "tile_kind": "Floor",
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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@@ -988,7 +1793,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
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+    },
+    {
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+    },
+    {
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+    },
+    {
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+      "y": -3,
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+    },
+    {
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+    },
+    {
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@@ -1079,7 +1926,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -5,
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+    },
+    {
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+      "y": -4,
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+    },
+    {
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+      "visibility": "Forward",
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+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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@@ -1177,7 +2066,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
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+    },
+    {
+      "tile_kind": "Floor",
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+    },
+    {
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+    {
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+    {
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+    },
+    {
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+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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@@ -1282,7 +2213,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
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+    },
+    {
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+    },
+    {
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+      "y": -5,
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+    },
+    {
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+      "y": -4,
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+    },
+    {
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+      "y": -3,
+      "z": 0
+    },
+    {
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+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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@@ -1380,7 +2353,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -5,
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+    {
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+      "y": -4,
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -3,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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@@ -1471,7 +2486,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+    },
+    {
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+    {
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+    },
+    {
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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@@ -1562,7 +2619,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -5,
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+    },
+    {
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+    {
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+      "visibility": "Forward",
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+    },
+    {
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+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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@@ -1646,7 +2745,49 @@
       "z": 0
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    },
+    {
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+      "y": -5,
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+    {
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+    },
+    {
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+      "y": -3,
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+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
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       "y": -1,
@@ -1730,7 +2871,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -4,
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+    },
+    {
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+      "visibility": "Forward",
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+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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       "y": -1,
@@ -1807,7 +2990,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -6,
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+    {
+      "tile_kind": "Floor",
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+      "y": -5,
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+    {
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+      "y": -4,
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+    {
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+    },
+    {
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+      "y": -2,
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+    {
+      "tile_kind": "Floor",
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@@ -1877,7 +3102,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -6,
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+    {
+      "tile_kind": "Floor",
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+      "y": -5,
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+    {
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+      "y": -4,
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+    },
+    {
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+      "y": -3,
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+    },
+    {
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+      "visibility": "Forward",
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+      "y": -2,
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+    },
+    {
+      "tile_kind": "Floor",
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       "y": -1,
@@ -1947,7 +3214,49 @@
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     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
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+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
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+      "y": -5,
+      "z": 0
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+    {
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+      "visibility": "Forward",
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+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
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+      "y": -3,
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+    {
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+      "y": -2,
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+    {
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@@ -2010,7 +3319,49 @@
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     {
-      "tile_kind": "Wall",
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+      "y": -7,
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+    {
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+      "y": -6,
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+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 27,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 27,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 27,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 27,
       "y": -1,
@@ -2073,7 +3424,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 28,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 28,
       "y": -1,
@@ -2129,7 +3522,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 29,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 29,
       "y": -1,
@@ -2185,7 +3620,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 30,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 30,
       "y": -1,
@@ -2234,7 +3711,49 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 31,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 31,
       "y": -1,
@@ -2276,46 +3795,445 @@
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 32,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": -1,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": 0,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": 1,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": 2,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": 3,
       "z": 0
     },
     {
-      "tile_kind": "Wall",
+      "tile_kind": "Floor",
       "visibility": "Forward",
       "x": 32,
       "y": 4,
       "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": 2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 33,
+      "y": 3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": 2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 34,
+      "y": 3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 35,
+      "y": 2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": 1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 36,
+      "y": 2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -7,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -6,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -5,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -4,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -3,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -2,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": -1,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": 0,
+      "z": 0
+    },
+    {
+      "tile_kind": "Floor",
+      "visibility": "Forward",
+      "x": 37,
+      "y": 1,
+      "z": 0
     }
   ]
 }
diff --git a/server/tests/serialization.rs b/server/tests/serialization.rs
index 959f93d57..5ac7d2c57 100644
--- a/server/tests/serialization.rs
+++ b/server/tests/serialization.rs
@@ -38,6 +38,7 @@ fn test_snapshot(tick: u64, entities: Vec<VisibleEntity>) -> ObserverSnapshot {
         save_result: None,
         triangle_crisis_events: vec![],
         state_hash: None,
+        debug_response: None,
         sim_errors: vec![],
     }
 }
@@ -299,6 +300,7 @@ fn snapshot_v2_fields_roundtrip() {
         save_result: None,
         triangle_crisis_events: vec![],
         state_hash: None,
+        debug_response: None,
         sim_errors: vec![],
     };
 
@@ -354,7 +356,7 @@ fn protocol_version_constant_matches_snapshot() {
     let snapshot = test_snapshot(0, vec![]);
     assert_eq!(snapshot.version, PROTOCOL_VERSION);
     assert_eq!(
-        PROTOCOL_VERSION, 17,
+        PROTOCOL_VERSION, 18,
         "bump this assertion when protocol version changes"
     );
 }
@@ -406,6 +408,7 @@ fn all_facing_direction_variants_roundtrip() {
             save_result: None,
             triangle_crisis_events: vec![],
             state_hash: None,
+        debug_response: None,
             sim_errors: vec![],
         };
         let bytes = rmp_serde::to_vec_named(&snapshot).expect("serialize");