diff --git a/js/world.mjs b/js/world.mjs
index 95349f3..fd7b180 100644
--- a/js/world.mjs
+++ b/js/world.mjs
@@ -7,7 +7,7 @@ export const CENTER = Math.floor(BOX_SIZE / 2);
 
 function create_world (size) {
 	return {
-		tiles: Array(BOX_SIZE).fill(0).map(_ => Array(BOX_SIZE).fill(0)),
+		tiles: Array(size).fill(0).map(_ => Array(size).fill(0)),
 	};
 }
 const world = create_world(BOX_SIZE);