Lucido Sudoku
Logic puzzles, daily
Free · Designed for iPad. Not verified for macOS.
Master Sudoku with intelligent hints & daily challenges. Unique puzzles every time. Play on iPhone, iPad or Mac. Free!
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's New in 1.0.2
Stability improvements and performance optimizations
The developer, Thia Solutions LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
- Diagnostics
- Surroundings
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
- Surroundings
- Other Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Thia Solutions LLC
- Size
- 19 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Thia Solutions LLC