diff --git a/src/components/ParityBitsGame.tsx b/src/components/ParityBitsGame.tsx
index cf75cf0..980f74b 100644
--- a/src/components/ParityBitsGame.tsx
+++ b/src/components/ParityBitsGame.tsx
@@ -90,10 +90,9 @@ const ParityBitsGame = ({ showSocialShare = true }: ParityBitsGameProps) => {
       extended[gridSize][j] = calculateParity(column);
     }
     
-    // Calculate overall parity
+    // Calculate overall parity (XOR of all data bits)
     const allBits = grid.flat();
-    const rowParities = Array(gridSize).fill(null).map((_, i) => calculateParity(grid[i]));
-    extended[gridSize][gridSize] = calculateParity([...allBits, ...rowParities]);
+    extended[gridSize][gridSize] = calculateParity(allBits);
     
     setParityGrid(extended);
     setParityBitsAdded(true);