XOR

Flip tiles using tetromino shapes to solve the puzzle. Each shape you place flips the tiles it covers — dark becomes light, light becomes dark. The goal: restore the board to its original state.

How to play:

• Drag a shape from the panel onto the 5×5 grid
• Placing a shape flips all tiles it covers (XOR logic)
• Use every shape exactly once to solve the puzzle
• Undo your last move if you get stuck

Features:

• 4 difficulty levels — Easy (2 shapes) to Expert (7 shapes)|
• 7 classic tetromino shapes: I, O, T, S, Z, L, J
• Multiple color themes — warm brown, dark mode, and more
• Works on desktop and mobile (touch supported)
• Pixel art style with smooth tile animations