This game is not related to the game theme at all. It is just a sudoku. However, the rule of the sudoku is only for checking, not for generating. So actually this sudoku is simply a shift and fill game, which is quite boring. I suggest at lease enlarge the font size of the numbers to release player's pressure, and you may learn some real sudoku generation skill. If you could merge some elements of the theme, like some rows or columns does not fit the rule. It would be better.