Hot on the heels of the first two volumes,Kendoku: Extremeshows that when it comes to mind-bendingly difficult logic/arithmetic puzzles, too much is never enoug
Puzzle fans have fallen for KenKen and now crave more challenging puzzles. The puzzles in this edition range in size from 6x6 grids to 9x9 grids and for the fir
Your fun guide to the latest brain-teasing puzzle sensation Originally developed by a Japanese math teacher, Tetsuya Miyamoto, KenKen is the world's newest and