Color Sudoku 3.1

Sudoku puzzle games with numbers, letters or colors. Board size can be from 4 to 20 (default size is 9). You can play many variants - Killer, Greater Than, Consecutive, Odd/Even, Diagonal, Double, Triple, Butterfly, Flower, Windmill, Samurai. Every puzzle has unique solution. This program also contains editor and solver and it can create PDF which has multiple sudoku per page.