Puzzle Book Library
Sudoku Pro
Expert-level sudoku with step-by-step solving guides
Site Structure
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Enter from the main puzzle families, then drill into themed boards, variants, and printable sets.
Anti Knight
Arrow Sudoku
Between Lines
Classic Sudoku
Consecutive
Even Odd
Frame Sudoku
Free Hyper Sudoku Puzzles Online
Hyper Sudoku is related to Windoku but places its four extra regions in different positions, creating more difficult con…
Free Jigsaw Sudoku Puzzles — Irregular Sudoku Online
Jigsaw Sudoku replaces standard 3×3 boxes with irregularly shaped regions. Each region must still contain digits 1-9, bu…
Free Killer Sudoku Puzzles — Arithmetic Sudoku Online
Killer Sudoku is the world's most popular sudoku variant. Dotted-line cages show target sums — fill each cage so its dig…
Free Samurai Sudoku Puzzles — Five-Grid Sudoku Online
Samurai Sudoku features five overlapping 9×9 grids in an X formation. Shared corner boxes link the grids together — solv…
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Each type routes to archive pages built for worksheets, puzzles, and printable practice content.