Lucido Sudoku

Lucido Sudoku is the cleanest, most thoughtful Sudoku experience on iPhone and iPad.

Every puzzle is generated using real human solving techniques — the same logic you use when you play. That means difficulty ratings are meaningful, and hints actually teach you something.

WHY LUCIDO?
Most Sudoku apps use brute-force puzzle generation. Lucido uses technique-based solving — Naked Singles, Hidden Singles, Naked Pairs, Locked Candidates, and X-Wing patterns — so every puzzle is fair, graded accurately, and solvable by logic alone.

FEATURES
• Five difficulty levels — Beginner to Expert
• Daily Challenge — one fresh puzzle every day, the same for every player worldwide
• Progressive hints — four levels from gentle nudge to full reveal
• Candidate notes — jot down possibilities, cleared automatically as you solve
• Unlimited undo — step back through any move, no restart needed
• Stats & streaks — track your best times and hint-free completions per difficulty
• Timer — optional, hide it if you prefer a relaxed pace

HINTS THAT TEACH
Tap Hint once for a nudge. Tap again to focus on the right area. Tap again for a technique explanation. One more tap reveals the answer. You decide how much help you want.

DAILY CHALLENGE
A new puzzle resets at midnight. Same seed, same puzzle for every player worldwide — compare your time with anyone.

FREE TO PLAY
Lucido Sudoku is free with non-intrusive banner ads. You get 3 free hints per puzzle. Need more? Watch a short rewarded ad.

Download free. No account needed.