Crosslight
A small board. Five puzzles. Turn every light off.
CROSSLIGHT / LOGIC PUZZLE
Turn every light off.
Tap a tile to flip it and its neighbours above, below, left and right. Lit tiles are green. Each board can be solved.
Keyboard: Tab into the board, use arrow keys to move and Enter or Space to flip a tile. There is no timer.
Explore the strategyFlip the cross. Find the pattern.
ONE RULE TO LEARN
Every move
makes a cross.
Press a tile and its direct neighbours flip. Corners touch two neighbours, edges three, and the middle four. Diagonals stay as they are.
NO RUSH
Try. Undo.
Try again.
There is no timer or leaderboard. Every puzzle starts from a construction that can be reversed. You can always undo your last move.
Inside the puzzle
All articles ↗How to play Crosslight
The rules, controls and five solvable boards of a small browser logic puzzle.
A more deliberate way to solve Crosslight
Use reversible moves, row-by-row reasoning and a small experiment to understand the board.
Why every Crosslight puzzle has a solution
How the boards are constructed, why moves commute and what that means for finding a solution.