Logic Puzzle

Choose difficulty

Smaller boards teach the rules; larger boards demand planning.

How to play

Light Up–style logic

Place lamps on the empty cells. Numbers count lamps on the four touching sides. Lamps light in straight lines until a wall blocks them — and two lamps may not shine on each other. Every empty cell must end up lit.

• Tap a cell to cycle: empty → lamp → mark (pencil) → empty.
• Black cells are walls. Numbered walls say exactly how many lamps touch that wall on its four sides.
• Lamps cast light in the four directions until a wall stops the beam.
• Two lamps may not see each other along a row or column.
• Every non-wall cell must be lit when you’re done (lamps count as lit).