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Nonobench is an open-source benchmark of 49 LLMs solving nonogram (picross) puzzles without tools; solve rates drop sharply with grid size, with only a few frontier models clearing the 15x15 and hard 20x20 cases.
A developer created Puzzle Lair, a free logic puzzle site featuring Sudoku, Kakuro, Nonograms and more, with no ads and a one-time unlock for full catalogs.