The Minimalist Sudoku — Rätselportal — Logic Masters Deutschland
Minimalist Sudoku Club from easy to genius, Book 02, 160 easy level puzzles: Increase your mental agility with numbers: Publishing, Codex, Amigos, The Teachers: 9798840504161: Amazon.com: Books
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File:The first discovered minimal 9x9 Sudoku puzzle with 40 givens.png - Wikimedia Commons
Minimal Sudoku - Play Sudoku on the App Store
File:Minimal 9x9 Sudoku with 40 givens.svg - Wikimedia Commons