Dan Croker has two obsessions - Sudoku and frogs. So he just had to combine his loves and make the Famous Frog Sudoku books. This Bathroom Sudoku Series Book contains 800 very hard puzzles with 4 puzzles per page. Featuring a fun and colorful cover that is sure to brighten your day. Of course, you don't have to be in the bathroom to do these puzzles! Solutions are given at the end of the book. Look out for many more Famous Frog Sudoku books. Sharper Pencil, Giant Puzzle, Beach Bum, Travel Sudoku, Brain Yoga and Take A Break Series.