Watch the cross
Pressing a square flips that square and its up, down, left and right neighbors. Corners affect fewer lights.
AYE.GG / LOGIC
Light Grid
Every switch changes its neighbors. Turn the whole board dark.
Every board has a solution.
Moves0
Lights on0
Best on this size—
How to play Light Grid
Work methodically
Try clearing one row at a time. Pressing the same square twice cancels its effect; Undo reverses your last move.
Challenge a friend
Choose 4 × 4, 5 × 5 or 6 × 6, then share the puzzle link. Your friend opens the same starting board and can compare moves. Every board has a solution. Arrow keys move focus and Enter presses a square.