Color Sudoku

Sudoku puzzle games - Killer, Greater Than, Consecutive, Odd/Even, Diagonal, Double, Triple, Butterfly, Flower, Windmill, Samurai. You can choose letters or colors instead of digits. Board size can be from 4 to 20 (default size is 9). Every puzzle has unique solution. This program also contains editor and solver and it can create PDF file which has multiple sudoku per page. Other features are pencil marks, show candidates, unlimited undo/redo, save position to file, high scores, hint.