Zengaku »
Do you enjoy Sudoku? Take it to the next level with Zengaku [iPhone]
Zengaku is a number crunching brain teaser. It is like Sudoku, but with addition and a couple other wrinkles fused in. Much like Sudoku, you can only have the number 1-9 used once vertically and horizontally without any repetition. Zengaku, though, adds the twist that each adjacent grouping of numbers [...]