Sudoku Lab: Number Puzzle

Zen and Hardcore now live in the Play menu. Cleaner home screen, clearer hints, and a Rate button that finally works.

Sudoku Lab is a clean, focused free Sudoku game for iPhone and iPad. Master 4 difficulty levels, beat the Daily Challenge, and track your streaks.

FOUR GAME MODES • Classic — 4 difficulty levels (Easy, Medium, Hard, Expert) • Daily Challenge — same puzzle for every player, every day. Build your streak. • Zen Mode — practice freely, no lives, no pressure • Hardcore — unlock by completing 10 Expert puzzles. One mistake = game over.

BUILT FOR FOCUS • Pencil marks (notes) for advanced play • Auto-notes shortcut • Unlimited undo • Hints when you're stuck • Conflict highlighting • Lives system (3 strikes in Easy/Medium, 2 in Hard/Expert)

TRACK YOUR PROGRESS • 34 achievements to unlock • Best times per difficulty • Daily streak tracker • Detailed stats per mode

FREE TO PLAY Sudoku Lab is free, supported by ads: a banner on the home screen and an ad between games. Inside a puzzle, an ad only plays if you choose to watch one — for a hint or an extra life. No signup, no subscription — your progress is saved on your device.

ABOUT NIOL Sudoku Lab is a title from NIOL studio — also makers of Block Lab, a block puzzle game.

Built with care for puzzle lovers.