Solo Sudoku

Features

• See puzzle
• See difficulty rating of puzzle
• Navigate puzzle with arrow keys
• fill in cells using number keys
• remove cell value with backspace or 0
• Check for Mistakes
• Reset Puzzle
• unit tests
• auto-solve simple
• auto-solve hard
• Generate puzzles

Roadmap

• add font awesome
• horizontal layout
• no-distractions mode
• footer

New Features

• mistake highlighting
• timer
• number buttons for mobile
• hint / hints used
• game history
• Create a library for sudoku gen
  • custom sudoku difficulty params

Difficulties

For the current implementation, we just use Legacy. Which is actually kinda cool because you'll be surprised.

• Legacy: hole positions + minBound (aka, try 50, see what you get)
• Crude: targeted range of holes + minBound (aka. 32-35 holes)
• Graded: rank techniques and dig as much as grade allows
• Balanced Grading: Complexity score which allows several harder rank holes
• Hybrid Grading: Rank techniques + bounds

Grading Techniques

Beginner

You can directly put a value

• Last cell in row
• Hidden singles

Very Easy

You can directly exclude a value, leading to a value

• Direct pointing
• Direct claiming

Easy

You can exclude a value, narrowing down possibilities

• Pointing / Naked Pairs
• Claiming

Medium

You can exclude a value based on (double) superposition

• X-wing
• Hidden pairs
• naked triplets

Hard

Triple superposition

• Swordfish
• Hidden triplets
• Skyscraper
• etc..

Very Hard

lots of holes

• complex, partial trial and error

Impossible

as much holes as possible

• brute force probably required

Anyways for now we stick with Legacy Difficulty.