Shapedoku Library

Browse by topic

Our 580 guides, organized into ten collections so you can go deep on whatever interests you - from beginner solving tips to advanced techniques, the many Sudoku variants, the math underneath, wellbeing, accessibility, and the culture around the puzzle.

How to use this library

Each collection below gathers every guide on one theme, from the most basic to the most advanced. If you are new, start with How to Play and then move to Solving Techniques, which is ordered roughly in the sequence a solver actually learns them: singles first, then pairs and box-line reductions, then fish, wings, chains and uniqueness arguments. Every technique article includes a worked example you can reproduce in our solver.

Curious about the puzzles beyond classic Sudoku? The Sudoku Variants and Puzzle Explainers collections explain the rules and opening strategy for dozens of grid puzzles, while Math and Science digs into why a 9x9 grid behaves the way it does. Read about how we research and check these guides on our editorial policy page.