Nonogram Puzzle

Fill in the grid using the number clues to reveal a hidden picture. Every puzzle is freshly generated and checked so it has exactly one solution that you can reach by logic alone, with no guessing.

How to use the Nonogram Puzzle

1. Pick a size and difficulty, then press New puzzle. 5×5 is a quick warm-up; 15×15 takes a while.
2. Read the clues. The numbers beside each row and above each column give the lengths of the filled blocks in that line, in order. Blocks are separated by at least one empty square.
3. Fill squares by clicking or tapping them; drag to fill several in a row. Switch to the ✕ tool (or right-click) to mark squares you know are empty.
4. Use logic: start with big numbers that overlap in the middle of a line, then use crossing rows and columns. If you get stuck, press Hint.
5. Finish the picture. When every filled square is correct, the puzzle is solved and the picture appears.

Nonogram solving techniques

1. Simple boxes (overlap). Slide a block as far left as it can go, then as far right. Squares covered in both positions must be filled. In a 10-wide row, a clue of 6 always fills squares 5 and 6; a clue of 8 fills squares 3 to 8.
2. Full lines. If the clue numbers plus one gap between each block add up to the line length, the whole line is fixed. In a 10-wide row, 4 3 1 needs 4 + 3 + 1 + 2 gaps = 10 squares, so there is only one way to place it.
3. Zero lines and empty squares. A clue of 0 means the line is empty: cross it out. Squares that no block can reach are empty too.
4. Finished blocks. When a block reaches its full length, put a cross on both ends of it.
5. Edges. A filled square near the edge of the grid often forces the first block to extend away from the edge.
6. Cross-check. Every square you decide in a row gives new information to its column. Keep switching between rows and columns until the picture appears.

Puzzle sizes and difficulty

Difficulty sets how many squares are filled: about 62% on Easy, 55% on Medium and 48% on Hard. Fewer filled squares means smaller numbers and fewer easy overlaps, so you need more cross-checking between rows and columns.

Controls

Frequently asked questions

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