Advanced Sudoku Websites
Hard Sudoku - difficult sudoku puzzles and books
- difficultsudoku.com
Hard Sudoku books. Difficult Sudoku books. Top quality puzzles on top quality paper!
Not Applicable
$
8.95
Sudoku Kingdom - Play free sudoku puzzles online
- kingdomofsudoku.us
Provides Sudoku puzzles for printing, or to play online. Select a puzzle by difficulty level, time constraints, or simply print out a puzzle to take with you on a trip.Brain training game.
Not Applicable
$
8.95