Online practice
Choose a puzzle and take your time.
Each sample is fixed and reviewed. Notes, undo, checking, and an optional full solution are available without an account.
Open Easy practice →GridHearth Sudoku
Begin with a reviewed Easy puzzle, learn two dependable starter techniques, then carry the same solving rhythm onto paper.
Available now in this preview
Online practice
Each sample is fixed and reviewed. Notes, undo, checking, and an optional full solution are available without an account.
Open Easy practice →Learn
Worked examples show a naked single and a hidden single before the five-step practice routine brings them together.
Read the guide →First paperback
180 puzzles · 120 pages · still in production
Book details →