Ninefold is an ad-free sudoku app for iOS, Android, and HarmonyOS. It brings together 25,000 puzzles across five difficulty tracks, with 5,000 puzzles in each track. Every board is checked for a unique solution, so progress comes from logic rather than guessing.

Play a daily challenge, revisit puzzles from earlier dates, or keep pushing into Hell mode after Expert. Offline play makes Ninefold a quiet companion for commutes, short breaks, and a daily puzzle habit.

Ninefold

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