Lamp Grid
Light every square with lamps — no lamp may shine on another.
Every white square is lit.
A lamp lights its own square and shines along its row and its column until a wall or the edge of the board stops it.
A lamp lights its own square and shines along its row and its column until a wall or the edge of the board stops it.
Two lamps in one row or column with no wall between them light each other. Both are marked until one of them moves.
A numbered wall has exactly that many lamps on its four sides: above, below, left and right. A wall with no number may have any.
Tap once for a lamp, twice for a dot that means no lamp here, three times to empty the square. Dots are notes and never count. Stuck? A hint places a lamp or takes a wrong one away. In ranked play, each hint adds 15 s.
Tap a square for a lamp, again for a dot that means no lamp, and again to empty it · keyboard: arrows move, Space or Enter changes the square, Backspace empties it
Got it — play