This book contains 150 brand NEW, previously UNPUBLISHED Jigsaw Sudoku puzzles and variants thereof. All in all, you get: 10 puzzles 8x8 in size (just to warm your fingers) 50 classic Jigsaw Sudoku puzzles (9x9) 10 puzzles 10x10 in size (remember to use the zero ) 10 Diagonal Jigsaw Sudoku (no repeats on the diagonals) 10 Jigsaw Combo (both classic Sudoku and Jigsaw) 10 Jigsaw Windoku (4 additional square nonets) 10 Jigsaw TriDoku - these are extra special and you should first get a hang of classic TriDoku. 10 Outside Jigsaw - the clues have been thrown outside the puzzle 10 Non-Consecutive Jigsaw - two numbers that are touching may not be consecutive 10 Jigsaw TwoDoku - 2 slightly overlapping puzzles 10 Outside Jigsaw TwoDoku - A world premier Jigsaw (or irregularly shaped) Sudoku puzzles share the same rules with classic Sudoku. The only difference is that the nine nonets are, well, irregularly shaped. This makes the puzzles slightly harder than the original Sudoku and surely more entertaining, because every puzzle has a unique nonet design and therefore, they can never become boring.