Sudoku techniques, one at a time

A free Sudoku course: every technique the Skudo hint engine knows, from the three rules to 3D Medusa, each with worked examples and solver-checked practice puzzles.

1 of 27 articles published. The rest arrive batch by batch; nothing here links to a page that does not exist yet.

Foundations

1. Sudoku Rules — the 3 constraintsThe three constraints every puzzle rests on, and how to read a grid.
2. Scanning, Cross-hatching & Last DigitComing soon
3. Killer Sudoku & the Rule of 45Coming soon

Singles

1. Naked SingleComing soon
2. Hidden SingleComing soon