Lazy Sudoku

Advanced sudoku for serious solvers. 30+ techniques, automatic pencil marks, chain visualisation. No ads. Let the app handle the tedious work while you enjoy the logic.

Lazy Sudoku: Work Smarter, Not Harder

Tired of sudoku apps cluttered with ads, poor visual aids, and no explanations for advanced techniques? Lazy Sudoku is built for serious solvers who want sophisticated analytical tools without the frustration.

What Makes Lazy Sudoku Different:

30+ techniques including AICs, ALSs, finned fish, and forcing chains Natural Apple Pencil input with gesture recognition Scan puzzles from anywhere with on-device OCR Automatic pencil marks and pattern detection Query all available moves at any point Three-level hint system with detailed visual analysis Shape-coded chain endpoints for accessibility Multi-game save system per difficulty level Built-in puzzle editor with real-time validation

Advanced Techniques That Matter

From basic candidates to exotic patterns, Lazy Sudoku recognises and explains the techniques that solve challenging puzzles:

Alternating Inference Chains (AICs) with groups, ALSs, and URs Almost Locked Sets and Death Blossom Fish variations: X-Wing, Swordfish, Jellyfish, finned and sashimi Forcing chains: digit, cell, unit, and Nishio XY-Chains, WXYZ-Wings, and rectangle eliminations BUG, Unique Rectangles, and extended patterns

Interactive examples embedded in documentation show exactly why each technique works.

Let the App Handle the Tedious Work

Why waste time managing pencil marks manually? Lazy Sudoku automatically maintains candidates, highlights patterns, and visualises chains—so you can focus on the satisfying logic instead of bookkeeping.

Automatic pencil marks kept perfectly synchronised Auto-highlighting of naked and hidden candidates Multi-digit filtering to focus on specific candidates Browse all available techniques without waiting for rare patterns

Sophisticated Hint System

Choose your level of assistance: subtle nudges, clear highlighting, or detailed analysis with links, graphs, kill zones, and grid annotations showing exactly why techniques work.

Natural Tablet Experience

Write numbers directly with Apple Pencil using gesture recognition. The specially designed layout keeps controls accessible but out of the way—perfect for natural pen-and-paper solving.

Get Puzzles Your Way

Built-in editor with real-time validation (unique/multiple solution detection), paste forum format text, or scan from anywhere with on-device OCR. Handles perspective distortion, curved pages, standard fonts, and even some handwriting. Edit against background image to correct errors.

Manage Multiple Games Intelligently

Unlike apps that save one puzzle, Lazy Sudoku manages multiple games per difficulty level—current game plus unlimited abandoned puzzles you can return to later. Custom puzzles and favourites work the same way.

Interactive Documentation

Learn techniques with embedded puzzle widgets, step-through demonstrations, and curated examples.

Premium Experience, No Compromises

Completely ad-free, clean interface, left-handed mode on all devices, native on iPhone/iPad/Mac. Designed by a developer with 25 years of experience.

Who Is This For?

Solvers who know their way around AICs and fish patterns, want to learn advanced techniques with clear explanations, and value analytical tools over casual gameplay. This isn't a casual puzzle game—it's a sophisticated analytical tool that respects your intelligence and your time.

Download Lazy Sudoku and experience sudoku the way it should be: challenging, educational, and free from distraction.

EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/