Sudoku and Permudoku

Sudoku and Permudoku is a puzzle game that offers two distinct styles of logic puzzles. In the Sudoku mode, the player is tasked to fill out a 9 x 9 field with numbers from 1 to 9, such that each row, each column and each 3 x 3 sub-field contains exactly one occurance of each of the numbers 1 to 9. Permudoku is a variation of the classic Sudoku puzzle, where instead of numbers, colours have to be placed on a 9 x 9 in such a way that each colour appears exactly once in each column, row and 3 x 3 sub-field. However, from the beginning, all fields are already coloured, the players task is to swap...