diff --git a/js/tower.js b/js/tower.js
index 51be130..d74ffae 100644
--- a/js/tower.js
+++ b/js/tower.js
@@ -71,25 +71,30 @@ export function main() {
     grid.add_tile(tiles.BRIDGE_LR, 92, 52);
     grid.add_tile(tiles.BRIDGE_LR, 92, 36);
     grid.add_tile(tiles.BRIDGE_LR, 92, 20);
+    function add_debug_tile(x, y, color) {
+        const div = document.createElement('div');
+        real.appendChild(div);
+        div.style.gridColumnStart = `${x + 1}`;
+        div.style.gridRowStart = `${y + 1}`;
+        div.style.gridColumnEnd = 'span 1';
+        div.style.gridRowEnd = 'span 1';
+        div.style.backgroundColor = color;
+        div.style.opacity = '0.3';
+        div.style.zIndex = '1000000';
+    }
     {
         const m = grid.masks.get('walkable').mask;
         for (let x = 0; x < m.length; x++) {
             for (let y = 0; y < m[x].length; y++) {
-                if (!m[x][y]) {
+                if (m[x][y]) {
+                    add_debug_tile(x, y, 'orange');
                     continue;
                 }
-                const div = document.createElement('div');
-                real.appendChild(div);
-                div.style.gridColumnStart = `${x + 1}`;
-                div.style.gridRowStart = `${y + 1}`;
-                div.style.gridColumnEnd = 'span 1';
-                div.style.gridRowEnd = 'span 1';
-                div.style.backgroundColor = 'orange';
-                div.style.opacity = '0.3';
-                div.style.zIndex = '1000000';
             }
         }
     }
+    add_debug_tile(118, 23, 'blue');
+    add_debug_tile(44, 94, 'red');
     function rand(min, max) {
         return Math.round(Math.random() * (max - min) + min);
     }
diff --git a/js/tower.js.map b/js/tower.js.map
index e93dc01..0362136 100644
--- a/js/tower.js.map
+++ b/js/tower.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"tower.js","sourceRoot":"","sources":["../ts/tower.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,IAAI,EAAE,MAAM,WAAW,CAAC;AACjC,OAAO,EAAE,qBAAqB,EAAE,MAAM,8BAA8B,CAAA;AACpE,OAAO,KAAK,KAAK,MAAM,YAAY,CAAC;AAEpC,MAAM,UAAU,IAAI;IAClB,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,MAAM,GAAG,GAAG,CAAC;IACjC,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,eAAe,GAAG,OAAO,CAAC;IAC9C,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,OAAO,GAAG,MAAM,CAAC;IACrC,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,cAAc,GAAG,QAAQ,CAAC;IAE9C,MAAM,IAAI,GAAG,QAAQ,CAAC,aAAa,CAAC,KAAK,CAAC,CAAC;IAC3C,QAAQ,CAAC,IAAI,CAAC,WAAW,CAAC,IAAI,CAAC,CAAC;IAChC,IAAI,CAAC,KAAK,CAAC,KAAK,GAAG,mBAAmB,CAAC;IACvC,IAAI,CAAC,KAAK,CAAC,MAAM,GAAG,+BAA+B,CAAC;IACpD,IAAI,CAAC,KAAK,CAAC,QAAQ,GAAG,QAAQ,CAAC;IAE/B,MAAM,IAAI,GAAG,QAAQ,CAAC,aAAa,CAAC,KAAK,CAAC,CAAC;IAC3C,IAAI,CAAC,WAAW,CAAC,IAAI,CAAC,CAAC;IACvB,IAAI,CAAC,KAAK,CAAC,KAAK,GAAG,mBAAmB,CAAC;IACvC,IAAI,CAAC,KAAK,CAAC,MAAM,GAAG,+BAA+B,CAAC;IACpD,IAAI,CAAC,KAAK,CAAC,QAAQ,GAAG,UAAU,CAAC;IACjC,IAAI,CAAC,KAAK,CAAC,GAAG,GAAG,qCAAqC,CAAC;IACvD,IAAI,CAAC,KAAK,CAAC,IAAI,GAAG,sCAAsC,CAAC;IAEzD,MAAM,IAAI,GAAG,IAAI,IAAI,CACnB,IAAI,EACJ,GAAG,EAAE,GAAG,EACR,WAAW,EACX,CAAC,MAAM,EAAE,OAAO,EAAE,QAAQ,EAAE,SAAS,EAAE,YAAY,CAAC,EACpD,CAAC,UAAU,EAAE,aAAa,CAAC,CAC5B,CAAC;IAEF,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACvC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,CAAC,CAAC,CAAC;IACpC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACrC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,OAAO,EAAE,GAAG,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,KAAK,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IAEnC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACtC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,EAAE,CAAC,CAAC,CAAC;IAErC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACvC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACvC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACvC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IACvC,IAAI,CAAC,QAAQ,CAAC,KAAK,CAAC,SAAS,EAAE,EAAE,EAAE,EAAE,CAAC,CAAC;IAEvC,SAAS,cAAc,CAAC,CAAS,EAAE,CAAS,EAAE,KAAa;QACzD,MAAM,GAAG,GAAG,QAAQ,CAAC,aAAa,CAA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\ No newline at end of file
diff --git a/ts/tower.ts b/ts/tower.ts
index 32caacd..9781277 100644
--- a/ts/tower.ts
+++ b/ts/tower.ts
@@ -85,26 +85,33 @@ export function main() {
   grid.add_tile(tiles.BRIDGE_LR, 92, 36);
   grid.add_tile(tiles.BRIDGE_LR, 92, 20);
 
+  function add_debug_tile(x: number, y: number, color: string) {
+    const div = document.createElement('div');
+    real.appendChild(div);
+    div.style.gridColumnStart = `${x + 1}`;
+    div.style.gridRowStart = `${y + 1}`;
+    div.style.gridColumnEnd = 'span 1';
+    div.style.gridRowEnd = 'span 1';
+    div.style.backgroundColor = color;
+    div.style.opacity = '0.3';
+    div.style.zIndex = '1000000';
+  }
+
   {
     const m = grid.masks.get('walkable')!.mask;
     for (let x = 0; x < m.length; x++) {
       for (let y = 0; y < m[x].length; y++) {
-        if (!m[x][y]) {
+        if (m[x][y]) {
+          add_debug_tile(x, y, 'orange');
           continue;
         }
-        const div = document.createElement('div');
-        real.appendChild(div);
-        div.style.gridColumnStart = `${x + 1}`;
-        div.style.gridRowStart = `${y + 1}`;
-        div.style.gridColumnEnd = 'span 1';
-        div.style.gridRowEnd = 'span 1';
-        div.style.backgroundColor = 'orange';
-        div.style.opacity = '0.3';
-        div.style.zIndex = '1000000';
       }
     }
   }
 
+  add_debug_tile(118, 23, 'blue');
+  add_debug_tile(44, 94, 'red');
+
   function rand(min: number, max: number): number {
       return Math.round(Math.random() * (max - min) + min);
   }