diff --git a/js/world.js b/js/world.js
index 2b57938..2106d85 100644
--- a/js/world.js
+++ b/js/world.js
@@ -33,6 +33,15 @@ function getOrCreateChunk(chunkX, chunkY) {
         // Create a new chunk with empty pixels
         const chunkData = new Array(CHUNK_SIZE * CHUNK_SIZE).fill(EMPTY);
         
+        // Fill the chunk below the floor (y = -1) completely with stone
+        if (chunkY === -1) {
+            for (let y = 0; y < CHUNK_SIZE; y++) {
+                for (let x = 0; x < CHUNK_SIZE; x++) {
+                    chunkData[y * CHUNK_SIZE + x] = STONE;
+                }
+            }
+        }
+        
         // Add floor at the bottom of the world (y = 0 and y = 1)
         if (chunkY === 0 || chunkY === 1) {
             // Fill the bottom row with walls