Classic Sudoku is a number puzzle game, which is to place 1 to 9 numbers into each grid cell. Each number can only appear once in each row, each column and each 3x3 grid block.

Unkind Sudoku is sudoku puzzle game on Google Play. You can enjoy unlimited suduku puzzles in 4 difficulty levels. And you can challange any sudoku within the limited time in each level. This game is designed to use your brain only.