Sightweave

Kuromasu puzzle online

Each number counts the light cells it can see in its row and column, including itself. Dark cells stop the view.

Practice

Practice and daily boards

Eight practice puzzles begin on a 3 × 3 board before moving to 4 × 4. The daily mode selects a fixed board for the UTC day from a separate original set. A hint explains one forced move, so you can continue solving.

Your moves stay in this browser. Return to the same mode and puzzle to continue. You can switch boards without clearing unfinished progress.