Lights Out

A glowing logic puzzle: flip the neighbours and find perfect darkness.

How to play Lights Out

Turn all 25 lights off. Pressing a tile flips it and its neighbours above, below, left and right. Every starting board is solvable. Each move costs 15 points; a hint highlights a useful next tile and costs 25. There is no time limit.

Tap a tile, or move the cursor with arrows/WASD and press Space/Enter. Tap Hint or press H for help.

Inspired by Lights Out. An independent, original browser adaptation.