Color Sudoku

In the classic Sudoku game, the digits 1 to 9 are placed in a square in such a way that no two digits are the same in any row, column or nine 3x3 squares.
> Here you can also choose between digits, letters or colours and also between different sizes. Another extension is the option to not have two digits on both diagonals. Other variations are sum (Killer, SumDoKu, Samunamupure), in which the playing area is divided into regions and each region has a specific sum, comparative (Greater than), in which between some squares the symbols are greater/lesser, consecutive (Consecutive), even/odd and then multiple variations (Samurai, Flower, Butterfly, ...). The program can solve the sudoku you give it, and it can also generate PDFs.