Binary puzzles, also known as Takuzu, are not Sudoku The grid can be a square of any even size, such as 8x8, 10x10, 12x12, 14x14 and so on. And you use only the binary digits 0 and 1 to solve it The rules are simple: there can be at most two 0s next to one another; same for the 1s. So, 00 is Ok, but 111 is not ok. Of course 010 or 101 are fine in each row and in each column half of the digits must be 1s and a half must be 0s any two rows can't be completely the same. similarly, two columns can't be the same. The book contains 200 puzzles in various sizes: 20 puzzles in size 6x6 30 puzzles in size 8x8 100 puzzles in size 10x10 30 puzzles in size 12x12 20 puzzles in size 14x14 They are of various difficulties, from EASY to INSANE, but don't worry, there are also detailed instructions with explanations of solving techniques. Ready? ENJOY