Dan Croker has two obsessions - Sudoku and frogs. So he just had to combine his loves and make the Famous Frog Sudoku books. This sudoku puzzle book contains 1,000 puzzles, 500 hard and 500 very hard, with 4 puzzles per page and 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. More Famous Frog Sudoku series - Beach Bum Series 1 and 2, Bathroom Sudoku Series 1, Easy Series, Hard Series, Medium Series, Extra Hard Series, Brain Yoga, Sharper Pencil Series, Giant Series, Holiday Series, Take a Break and The Travel Series.