Sudoku Lab: Number Puzzle

NEW: 6 themes (including high-contrast for accessibility). Master daily puzzles, climb hardcore mode, unlock 34 achievements. Free, offline, no signup.

Sudoku Lab is the most polished free Sudoku game for iPhone and iPad. Play offline, master 4 difficulty levels, beat the Daily Challenge, and track your streaks.

THREE 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

6 THEMES • NIOL (default dark) • Light, Ocean, Forest, Sunset, Lavender • High Contrast (built for accessibility — color blindness tested)

NO INTERNET REQUIRED Play anywhere, anytime. No signup. No subscription. Your progress is saved on your device.

ABOUT NIOL Sudoku Lab is the first title from NIOL studio. Coming soon: Block Lab (block puzzle).

Built with care for puzzle lovers.