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Take a few quiet minutes to solve a number puzzle through careful deduction. Complete rows, columns, and regions with no repeated digits, and choose between compact 6×6 boards and classic 9×9 boards. PLAY YOUR WAY • Choose from three chapters with 20 puzzles in each chapter. • Try a locally selected daily challenge that works without an internet connection. • Enter an answer when you are sure, or use candidate notes to track possibilities. • Check the board for row, column, and region conflicts without revealing solutions. • Request up to three hints per puzzle, each with a concise reasoning explanation. • Undo and redo moves, pause at any time, and safely restart or clear a board. LEARN AND IMPROVE An interactive 4×4 tutorial introduces row and column exclusion, region constraints, and unique candidates. Puzzle results show your completion time, undo count, hint count, and personal record. Local statistics track completed puzzles, fastest recorded times for each board size, and consecutive days with a completed daily challenge. YOUR PROGRESS STAYS WITH YOU Unfinished boards, candidate notes, elapsed time, and move history are saved on your device. Choose a light or dark appearance and adjust sound, motion, conflict markers, and candidate guidance to suit your play. The game works offline and does not require an account. Your preferences and puzzle records remain stored locally on your device.