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Build each board one thoughtful deduction at a time.

This offline number-logic game offers compact 6 × 6 puzzles and classic 9 × 9 boards. Work through three chapters, then return for a daily challenge selected on your device.

Every row, column and box follows a simple rule: use each value once. Place an answer when you are sure, or keep candidate notes in empty cells while you reason. Conflicting entries are marked without revealing a solution, and fixed clues are protected.

When you need help, request one of up to three optional hints. Each hint points to a cell and explains a deduction based on the board's constraints. Hint use is recorded separately from finishes completed without hints.

Pause whenever you like. Your current board, notes, timer and move history are saved locally, so you can return to an unfinished puzzle later. After a solve, review your time, undo actions, hint use and personal record.

Choose a light, dark or system appearance and adjust sound, haptic feedback, transitions and board highlights to suit your session. Progress, completed chapters and daily challenge history stay on your device.

No account or connection is needed to play. The game does not use an advertising or analytics service.