Perfect for puzzle-lovers at all levels!Whether you're new to the joys of Sudoku or a master of the most difficult variations, this is the book for you! Return of the Sudoku Challenge contains 275 all-new puzzles, including plenty of moderately-challenging puzzles for beginners and the time-rushed, a full supply of hard Sudoku puzzles, and a number of favorite variations, including the super-hot Random Block Sudoku, perfect for advanced puzzlers. We also included our Sudoku 101 Starter's Guide, plus the very best Sudoku-solving tips from the first Super Samurai Sudoku Challenge.