diff --git a/21g30t1e75.js b/21g30t1e75.js
index 4d0854c..c3eb296 100644
--- a/21g30t1e75.js
+++ b/21g30t1e75.js
@@ -84,13 +84,13 @@ GameLib.CustomCode.prototype.visualizeGrid = function (color) {
     this.starsGeometry = new THREE.Geometry();
 
 	this.grid.map(
-		function(x) {
-			this.grid[x].map(
-				function(y) {
+		function(x, xIndex) {
+			x.map(
+				function(y, yIndex) {
 					this.starsGeometry.vertices.push(
 						new THREE.Vector3(
-							x + GameLib.CustomCode.GRID_OFFSET_X,
-							y + GameLib.CustomCode.GRID_OFFSET_Y,
+							xIndex + GameLib.CustomCode.GRID_OFFSET_X,
+							yIndex + GameLib.CustomCode.GRID_OFFSET_Y,
 							5
 						)
 					);