Lamp puzzle

Lights: free lamp puzzle online

Light every white cell. Lamps shine up, down, left, and right until a wall, and no lamp may light another. A numbered wall counts lamps on its sides.

Play Lights Read rules Learn strategy

No account needed. For today's shared board, open the Daily Challenge.

Start here

Begin with numbered walls. A 0 rules out lamps in every white cell on its sides. If a wall still needs as many lamps as it has empty white cells on its sides, put a lamp in each of those cells.

RulesLearn how lamps shine, how wall numbers work, and when lamps can see each other. StrategyUse wall counts and cells that only one lamp can light.

How a turn works

Click a white cell to place or remove a lamp, or mark cells that must stay empty. Walls block light. Numbered walls count lamps next to them.

Difficulty

We aim for each board to fit one sitting. Easy is shorter. Hard takes longer. If you want more, start another puzzle.

EasyShorter open lines and more direct wall clues.

StandardMore cells can be lit from several places.

HardLonger sight lines make lamp choices depend on each other.