Nonogram

Use the row and column clues to reveal the hidden picture. Picross logic puzzles with fresh grids.

Nonograms were invented independently by two people in Japan in 1987 — Non Ishida, a graphics editor, and Tetsuya Nishio — and named Picross when Nintendo licensed them. The numbers describe runs of filled cells in each line, and the picture is the reward rather than the mechanism.

Solving is constraint propagation done by hand. The core technique is overlap: if a run is long relative to the line, the positions it must occupy regardless of where it starts are forced, and those cells can be filled immediately. Well-formed puzzles are designed so that line-by-line deduction always suffices and guessing is never required.