Second-Degree Black Belt Sudoku(r), Paperback

Everyone loves sudoku puzzles, finding them impossible to put down. The only problem: having enough sudokus to solve

Created in the United States, these addictive conundrums were originally called ``Number Place`` puzzles until their recent rise in popularity in Japan, where the name translated as sudoku. However, in a true sudoku, unlike a ``Number Place`` puzzle, the grids are symmetrical. This trait makes for a more elegant solve. Every puzzle included inside is symmetrical, which is not always the case in other sudoku books.

In this ``Martial Arts Sudoku`` series, we've indicated the skill level necessary to complete each book in the same way Japanese karate levels are ranked: by different colored belts. This is the Second-Degree Black Belt volume, filled with puzzles that will provide a sly, absorbing test for even the best, most proficient experts.

You'll go crazy for these super engaging brain bafflers