Pica: Nonograms

Every puzzle solvable by logic alone. Most nonogram apps will, sooner or later, hand you a board that cannot be finished without a guess. Pica will not. Every puzzle is put through a solver that uses only deduction, and a second, independent counter that confirms there is exactly one answer. Anything that fails either check does not ship. 240 puzzles, in five sizes. From a 5 × 5 you can finish on a bus to a 25 × 25 that will take an evening. Rated by the reasoning they need, not by how big they are — a large board with obvious runs is Gentle; a small one that needs you to hold two lines in your head at once is Brutal. A board that behaves. Drag to fill a run, and the first cell you touch decides whether you are filling or clearing — no flip-flopping halfway along. The gesture locks to a row or column once you have committed to a direction. A magnifier sits above your finger so your…