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.

Sudoku Solving Techniques

From naked singles to advanced fish, wings and chains.

How to Play and Solving Tips

Beginner guides, scanning, notes, hints and better habits.

Sudoku Variants

Killer, Thermo, Kropki, Samurai and dozens more.

Logic Puzzle Explainers

What is X: rules and strategy for puzzles beyond Sudoku.

Sudoku vs Other Games

Thoughtful comparisons with other puzzles and games.

Brain, Wellbeing and Habits

How puzzles fit calm, focus and daily routines.

The Math and Science of Sudoku

Latin squares, solvers, algorithms and the logic underneath.

Accessibility and Inclusive Play

Colorblind-friendly design, low vision, motor and cognitive access.

Shapedoku Guides

Features, modes, tips and getting the most from Shapedoku.

Sudoku Culture and History

Origins, competitions, teaching and puzzle culture.