Pure Sudoku

Pure Sudoku is classic 9×9 Sudoku, done simply. No ads, no account, no clutter. Just open the app and play.

Every puzzle is freshly generated and solved, not pulled from a fixed bank, so no two games are ever quite the same. Choose from four difficulty levels, Very Easy, Easy, Medium, or Hard. Difficulty is based on the actual logic needed to solve the puzzle, so a Hard puzzle really does need harder thinking, not just fewer starting numbers.

Play your way
• Pencil in candidate notes, with an option to auto-fill them
• Turn on auto-check to catch mistakes as you go
• Option to highlight related rows, columns, boxes, and matching numbers
• Optional Lives mode for a bit of extra pressure, with a limited number of mistakes allowed
• Undo any move, any time
• Track your best time, worst time, average time, and streaks for each difficulty

Hints that actually teach you
• When you're stuck, hints don't just fill in the answer. They walk you through real solving techniques, Naked Single, Hidden Single, Pointing Pairs, Naked Pairs, and more, showing you exactly where the logic applies and what it rules out. Over time, you'll start spotting these patterns yourself.
• Your progress, saved automatically
• Close the app mid-game and pick up right where you left off. Everything is stored on your device. No login, no cloud sync, no account needed.

Pure Sudoku is exactly what it sounds like: Sudoku, without the noise.

Recent changes:
• Modified Hint system to pause and teach solving techniques.
• Added Expert Difficulty Level
• Updated Hint system to show affected notes if needed.
• Added Lives (optional in settings)
• Added option to turn off Auto-Fill Candidates
• Added routine to account for corrupt preferences
• Added how to
• Added auto fill pencil candidates
• Added additional types of hints offered


• Made hints optional and added slider for number of hints offered