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 38 techniques learnt
Next up: Scanning
Your learning route
A clear route through Sudoku logic
Move from reliable fundamentals to advanced proof patterns. Each chapter builds on the one before it.
- 01
Foundations
Read the grid, finish units and make your first structured deductions.
0 of 10 - 02
Patterns
Use subsets, fish and wings to recognise relationships across the board.
0 of 10 - 03
Proof paths
Connect candidates, work with advanced fish and justify every elimination.
0 of 15 - 04
Expert finish
Close with uniqueness rules and sharpen your expert-level judgement.
0 of 3
Your chain journey
Build confidence with linked candidates: learn the pattern first, then prove it on a real board.
0 of 10 lessons read
0 of 10 puzzles practised
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 5 done · prepares you for Expert puzzles
Chains and colouring
Follow a candidate through the grid until the contradiction shows itself.
0 of 10 done · prepares you for Expert puzzles
Uniqueness arguments
A proper Sudoku has exactly one solution — and that alone rules patterns out.
0 of 3 done · prepares you for Expert puzzles
0 of 12 techniques learnt
Next Killer lesson: Cage combinations
Your cage logic journey
Build from cage arithmetic to precise sum interactions. Read the idea, then prove it in a real Killer puzzle.
0 of 12 lessons read
0 of 12 puzzles practised
0 of 3 chapters mastered
Killer practice mastery: 0%
Killer Sudoku techniques
0 of 12 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.
Cage foundations
Start with valid combinations, leftover sums and the no-repeat rule inside every cage.
0 read · 0 practised · 4 techniques
Sum relations
Use 45, innies and outies to connect cages with rows and columns.
0 read · 0 practised · 4 techniques
Precision eliminations
Finish with cage-line exclusions and Killer pairs when arithmetic meets candidate logic.
0 read · 0 practised · 4 techniques