Each
number tells you how many
light tiles sit in the 3×3 block around it
(the numbered tile
counts itself). Every tile — numbered or not — is either light or dark.
Fill the whole grid to reveal the picture.
Left‑click / drag: light
Right‑click / drag: dark
Click again: clear
A number turns grey once every tile in its 3×3 block has been marked. Every puzzle is generated to be solvable by pure logic — no guessing needed.
Keys: N new puzzle · Ctrl+Z undo · X tap colour · M music · [/] prev/next track. Music starts on your first click on the board.