diff --git a/js/tiletypes.js b/js/tiletypes.js
index 0161654..e5da2e8 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -41,24 +41,25 @@ const TILE_TYPES = {
             level.transmute_tile(me, 'wall');
         },
     },
+    // FIXME these should be OVERLAY by cc2 rules, but the cc1 tiles are opaque and cover everything else
     thinwall_n: {
-        draw_layer: LAYER_OVERLAY,
+        draw_layer: LAYER_TERRAIN,
         thin_walls: new Set(['north']),
     },
     thinwall_s: {
-        draw_layer: LAYER_OVERLAY,
+        draw_layer: LAYER_TERRAIN,
         thin_walls: new Set(['south']),
     },
     thinwall_e: {
-        draw_layer: LAYER_OVERLAY,
+        draw_layer: LAYER_TERRAIN,
         thin_walls: new Set(['east']),
     },
     thinwall_w: {
-        draw_layer: LAYER_OVERLAY,
+        draw_layer: LAYER_TERRAIN,
         thin_walls: new Set(['west']),
     },
     thinwall_se: {
-        draw_layer: LAYER_OVERLAY,
+        draw_layer: LAYER_TERRAIN,
         thin_walls: new Set(['south', 'east']),
     },
     fake_wall: {