Lazy Sudoku
Sergei Fedorov Games iPhoneiPadiPod touch
Lazy Sudoku is a free Games app for iPhone and iPad by Sergei Fedorov. Requires iOS 15.5. Updated June 21, 2026.
- Price
- Free
- on the App Store
- Size
- 203 MB
- Age 4+
- Updated
- Jun 21
- 2026 · v1.0.4
Screenshots
About Lazy Sudoku
Lazy on the notes. Sharp on the logic. A clean, ad-free Sudoku that takes care of the bookkeeping so you can enjoy the puzzle. Pencil marks update themselves. Hints show you where to look when you're stuck. Classic 9×9 or Diagonal Sudoku — relax with an easy one, or take on something harder. FEATURES • Automatic pencil marks — notes stay current while you play • Helpful hints — three levels, from a gentle nudge to a step-by-step walkthrough drawn on the grid • Classic Sudoku and Diagonal Sudoku (X-Sudoku) — both diagonals join rows, columns, and boxes as rules • Five difficulty levels — Easy through Diabolical, with curated puzzles in each • Three modes — Relaxed for clean play, Standard for everyday solving, Deep when you want every tool • Scan puzzles with on-device OCR — newspapers, books, printed sheets • Create your own — paste from anywhere, or build with live validation • Save multiple games per difficulty — pause and pick up any time • Track your progress — solved counts, time, personal bests • Made for Apple Pencil — handwriting, pressure-sensitive paper mode, hover support on iPad • Native on iPhone and iPad HINTS THAT ACTUALLY TEACH Most "teaching" sudoku apps name the technique and call it teaching. Lazy Sudoku walks you through it. Step-by-step spotting shows you where to look. Step-by-step eliminations show you why the move works. Drawn on the grid, explained in plain English. Get unstuck without being told the answer. AD-FREE, ALWAYS No ads. No banners. No interruptions. Just Sudoku. We do the bookkeeping. You do the thinking. Lazy on the notes. Sharp on the logic. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
What’s new
Version 1.0.4 · Updated June 21, 2026
New in this version: • Diagonal Sudoku (X-Sudoku) — both diagonals join rows, columns, and boxes as ninth-rule units. First-game tutorial, OCR auto-detect, full share-and-print round-trip. • Relaxed Mode gets a tutor — Explain narrates why a digit goes where it does, not just what to place. • Shadow Notes — faint ghost candidates show what's possible in a cell without cluttering your grid. • Sharing and Print — Copy and Get PDF actions in the share dialog, and the printed PDF includes your pencil marks. • Paper Mode deepens — Full Paper as a feel rather than a mode, naked-single hints one at a time, clearer pressure feedback. • New techniques — Fireworks, Bowman's Bingo, Aligned Pair Exclusion, Pattern Overlay Method, Remote Pair. They surface in hints and the picker when they apply. • Watched Techniques — mark a rare pattern and the app flags it the moment it shows up in a scan.
App privacy
The developer, Sergei Fedorov, reported these privacy practices to Apple.
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Identifiers: User ID, Device ID
- Usage Data: Product Interaction, Other Usage Data
- Diagnostics: Crash Data, Performance Data, Other Diagnostic Data
Used for: Analytics, App Functionality
Alternatives to Lazy Sudoku
Looking for apps like Lazy Sudoku? Here are 6 similar apps on the App Store. The highest rated is Sudoku · No Ads · Brain Puzzle (5.0/5), and all 6 are free to download.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Lazy Sudoku | – | Free | June 21, 2026 | |
| Sudoku - Brain Puzzles | – | Free | Sep 18, 2026 | Compare |
| Sudoku Pencil & Paper | – | Free | Aug 28, 2026 | Compare |
| Kirin Sudoku | – | Free | Sep 9, 2026 | Compare |
| Sudoku Offline: No Ads | – | Free | Sep 12, 2026 | Compare |
| Sudoku · No Ads · Brain Puzzle | 5.0 / 5 (1) | Free | Oct 21, 2026 | Compare |
| Kromatiko: Color Sudoku | – | Free | Aug 23, 2026 | Compare |
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