GG567Harbor

Make a little room for focused thinking with a collection of offline number puzzles.

Solve at your own pace
Fill every row, column, and box without repeating a number. Choose a gentle 6×6 board for a short session or settle into a standard 9×9 puzzle when you have more time. Boards move from approachable to deeper deduction as clues become less generous and relationships cross more often.

Keep your reasoning visible
Use candidate notes to record possibilities without committing an answer. Conflicting entries are marked clearly with color and shape, while original clues remain protected. Undo a change when a line of reasoning needs a fresh start, or check the board to confirm that your current trail is consistent.

Helpful, not hurried
There is no countdown. Optional hints explain a verifiable row and column relationship and are limited to three per board, so the satisfaction stays in the deduction. Pause at any time and return later with your entries, notes, timer, and progress intact.

A lasting local practice
Choose levels by chapter, try a daily board selected from the built-in collection, and review your completion statistics. Preferences include light and dark themes, motion, sound, conflict markers, and candidate assistance. Everything works offline and your records remain on your device.