Sudoku Binary - 200 Hard Puzzles 7x7 (Volume 12)

The binary puzzle (also known as "Binairo", "Takuzu", "Tohu wa Vohu") is a new logic puzzle that you can solve by using only zeros and ones. The rectangular or square grid should fill the numbers in accordance with the following rules:
- Each row and each column contain the same number of digits "1" as digits "0" (or one more for odd sized grids).
- The same number can only be in no more than two cells in a row.
- Each line must be unique, and each column must be unique. The puzzle book co...