XOR Grid: a quick playing guide
Every selected square switches its whole row and column between on and off. The square where they cross switches once. Your goal is to leave the entire board dark. Boards are created by making legal moves from a dark board, so every new puzzle has a solution. There may be more than one route to a clear board.
How do you control XOR Grid?
Click or tap a square to switch its row and column. Use Hint to see a useful next move, Reset to retry the same board, or New puzzle for another arrangement.
What should a beginner try?
Watch the entire row and column before choosing a square. A move is its own inverse: selecting the same square twice restores the previous board.
Do you need an account?
No. You can play this browser version without signing up or installing a plugin.