Skewdoku

Please see screenshots. It is seems famous puzzle that you know, but not so. This is our original puzzle Skewdoku. How to play. Put one of the numbers given in empty cells. Digits can not repeat on each diagonal line. Each region bounded by thick border contains each digit exactly once. This app has 4 patterns of board size. These are 5x5, 6x6, 8x8 and 9x9.