SUDOKUBLACK BELT

Classic Sudoku with a martial-arts journey — earn your belts from White to Black and beyond, one clean solve at a time.

Coming soon to the App Store

What makes it different

• Five graded levels. Easy through Master — every puzzle is logically solvable with no guessing required.
• Earn your belt. A karate belt ranking (White → Black → 10th Dan) that climbs as your lifetime skill grows.
• Learn & coach. A built-in technique guide and hints that teach real solving strategies, not just answers.
• Daily challenge. One shared puzzle a day with server leaderboards.
• Deep awards. Trophies, placement medals and dozens of badges to collect.
• Privacy-first. No tracking, no data sold.