Lazy Sudoku

Advanced sudoku for serious solvers. Automatic pencil marks, chain visualisation

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.
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
Query all available moves at any time
Browse technique patterns without waiting for rare techniques

Sophisticated Hint System
Choose your level of assistance with three hint modes:

Subtle: gentle nudges in the right direction
Obvious: clear visual highlighting
Detailed: complete analysis with links, graphs, kill zones, contradictions, and grid annotations

See exactly why a technique works with visual demonstrations that make even the most complex patterns crystal clear.
Advanced Techniques, Explained
From X-Wing and Swordfish to exotic patterns like XY-Chains, 3D Medusa, and BUG, Lazy Sudoku recognises and explains over 30 sophisticated techniques that make challenging puzzles solvable.

30+ solving techniques from basic to expert level
Step-by-step technique explanations with interactive examples
Visual demonstrations showing exactly why moves work
Shape-coded endpoints for accessible pattern recognition
Learn advanced strategies whilst solving

Natural Tablet Experience
Solving on iPad? The redesigned layout puts all controls within reach whilst keeping the grid spacious and uncluttered:

Write numbers directly with a stylus
Gesture-based input for speed
Controls accessible but out of the way
Perfect for natural pen-and-paper solving
Works on e-ink devices

Manage Multiple Games Intelligently
Unlike apps that only save one puzzle, Lazy Sudoku lets you juggle multiple games without losing progress:

Separate save slots for each difficulty level
Current game plus unlimited abandoned games per level
Give up on a tough puzzle and return to it later
Custom puzzle slots with the same flexible system
Mark custom puzzles as favourites for quick access

Switch between an easy morning puzzle, a challenging lunch break, and that expert puzzle you've been chipping away at—all without losing any progress.
Create Your Own Puzzles
The built-in puzzle editor includes real-time validation:

Instant feedback on solvability
Detects unique vs multiple solutions
Display solutions to strategically place clues
Save custom puzzles with full game management

Interactive Documentation
Learn techniques with embedded interactive puzzle scenarios:

Live puzzle widgets in documentation
Step-through technique demonstrations
Practise with curated examples
Master advanced strategies at your own pace

Premium Experience, No Compromises

Completely ad-free
Clean, focused interface
Left-handed mode on all devices
Native on iPhone and iPad
Regular updates with new features
Designed by a developer with 25 years of experience

Who Is This For?
Lazy Sudoku is for solvers who:

Know their way around X-Wings and Skyscrapers
Want to learn advanced techniques with clear explanations
Value analytical tools over casual gameplay
Appreciate a premium, ad-free experience
Solve challenging puzzles that require sophisticated strategies

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.