Lazy Sudoku

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 font