Food for Thought

"The only way to learn mathematics is to do mathematics." — Paul Halmos

Food for Thought

← All printable sudoku

Printable Evil Sudoku — Free PDF

Download 50 free printable evil sudoku puzzles as PDF, organized into 5 packs of 10. Evil printable sudoku puzzles are the hardest we publish — engineered to resist standard techniques and to push even expert solvers with forcing chains and deep logic. Every pack is US Letter size with one large puzzle per page — no registration, no email.

Champion's Mindset

"Gold medals aren't really made of gold. They're made of sweat, determination, and a hard-to-find alloy called guts." — Dan Gable

Champion's Mindset

Solving Evil Sudoku on Paper

Evil printable sudoku puzzles are the hardest we publish — engineered to resist standard techniques and to push even expert solvers with forcing chains and deep logic.

Bring a pencil and an eraser — pencil marks are the key to every intermediate and advanced technique. When you finish a pack, move up a level or check your solving speed online.