Sudoku learning path – learn every technique in order
Techniques are easier to learn in the right order: each stage only uses what the ones before it taught. Work through the ten stages, or jump straight to the technique you need — nothing is locked.
0 of 28 techniques learnt
Next up: Scanning
First steps
How to read a grid and place your first digits with confidence.
0 of 4 done · prepares you for Easy puzzles
Finishing units
Spot the moments where a row, column or box completes itself.
0 of 2 done · prepares you for Easy puzzles
Working with pairs
Two cells, two candidates: the first real deduction beyond scanning.
0 of 2 done · prepares you for Medium puzzles
Box and line interactions
Where a box overlaps a line, candidates start ruling each other out.
0 of 2 done · prepares you for Medium puzzles
Larger subsets
Triples and quads work like pairs, only with more cells to keep track of.
0 of 4 done · prepares you for Hard puzzles
Your first fish
Rectangular patterns of a single digit — X-Wing and its close relatives.
0 of 3 done · prepares you for Hard puzzles
Wings
Three cells linked by shared candidates, forcing a digit out of a fourth.
0 of 3 done · prepares you for Hard puzzles
Advanced fish
Swordfish and Jellyfish extend the X-Wing idea to three and four lines.
0 of 3 done · prepares you for Expert puzzles
Chains and colouring
Follow a candidate through the grid until the contradiction shows itself.
0 of 3 done · prepares you for Expert puzzles
Uniqueness arguments
A proper Sudoku has exactly one solution — and that alone rules patterns out.
0 of 2 done · prepares you for Expert puzzles
Killer Sudoku techniques
0 of 8 done · prepares you for Killer Sudoku puzzlesCage arithmetic on top of the classic rules. Work through the classic path first — everything there still applies, Killer only adds the sums.