Premium Subscription

Get complete access to every feature in Lazy Sudoku, including all Pro features, OCR scanning, plus the most advanced exotic techniques for solving the hardest puzzles.

All Pro Features Included

Premium includes everything from the Pro subscription and the OCR subscription:

• Smart Keyboard filtering
• Persistent Focus Overlay
• Auto-highlighting for Hidden Singles and Bi-value Cells
• All Pro-tier techniques
• Camera puzzle scanning (OCR)
• Automatic digit recognition

Premium Techniques

Premium unlocks the most sophisticated solving techniques for the hardest puzzles:

Advanced Chaining

• Grouped X-Cycles — X-Cycles with grouped nodes
• AIC with Groups — AICs using grouped nodes
• AIC with ALSs — AICs incorporating Almost Locked Sets
• AIC with URs — AICs incorporating Unique Rectangle logic
• Digit Forcing Chains — Chain from a single digit's candidates
• Nishio Forcing Chains — Chain testing candidate validity
• Cell Forcing Chains — Chain from all candidates in a cell
• Unit Forcing Chains — Chain from all candidates of a digit in a unit

Finned Fish

• Finned Squirmbag — Squirmbag with fins
• Finned Whale — Whale with fins
• Finned Leviathan — Leviathan with fins

Sashimi Fish

• Sashimi X-Wing — Finned X-Wing with missing base candidate
• Sashimi Swordfish — Finned Swordfish with missing base candidate
• Sashimi Jellyfish — Finned Jellyfish with missing base candidate
• Sashimi Squirmbag — Finned Squirmbag with missing base candidate
• Sashimi Whale — Finned Whale with missing base candidate
• Sashimi Leviathan — Finned Leviathan with missing base candidate

Franken Fish

Franken fish use a mix of rows/columns and boxes as base or cover sets:

• Franken X-Wing — 2-set Franken fish
• Franken Swordfish — 3-set Franken fish
• Franken Jellyfish — 4-set Franken fish

Finned Franken Fish

• Finned Franken X-Wing — Franken X-Wing with fins
• Finned Franken Swordfish — Franken Swordfish with fins
• Finned Franken Jellyfish — Franken Jellyfish with fins

Mutant Fish

Mutant fish use any combination of rows, columns, and boxes as base and cover sets:

• Mutant X-Wing — 2-set Mutant fish
• Mutant Swordfish — 3-set Mutant fish
• Mutant Jellyfish — 4-set Mutant fish

Finned Mutant Fish

• Finned Mutant X-Wing — Mutant X-Wing with fins
• Finned Mutant Swordfish — Mutant Swordfish with fins
• Finned Mutant Jellyfish — Mutant Jellyfish with fins

Sashimi Mutant Fish

• Sashimi Mutant X-Wing — Finned Mutant X-Wing with missing base candidate
• Sashimi Mutant Swordfish — Finned Mutant Swordfish with missing base candidate
• Sashimi Mutant Jellyfish — Finned Mutant Jellyfish with missing base candidate

Uniqueness Techniques

• Tridagon — Three-cell deadly pattern

Exotic Techniques

• Exocet — Junior Exocet pattern
• Double Exocet — Two interlocking Exocet patterns
• SK Loops — Stephen Kurzhals loop pattern
• Sue-de-Coq — Complex intersection pattern
• Death Blossom — ALS-based technique with stem cell
• Fireworks — Triple intersection pattern

Pattern-Based Methods

• Pattern Overlay Method — Overlay all valid digit patterns
• Solve Cell (Bowman's Bingo) — Trial-based solving