Haboku

Haboku is a Kakuro (cross sums) puzzle game. The player fills white cells with the digits 1 to 9 so that every run adds up to its clue, with no digit repeated in a run. Every puzzle is generated on the device, proved to have exactly one solution, and graded from Learning to Insane by the reasoning it needs. It has a puzzle of the day, curated packs, an optional tutorial that teaches the techniques one at a time, free play at a chosen size and grade, puzzles shared as short codes, and an ink-wash scene that changes with the season. It plays offline.