Sudoku2 is a board for playing the popular sudoku puzzle. You need to set the numbers from 1 to 9 in each row, column and square. Use left mouse click to increase the number, right click to decrease it and middle click to put a question mark if you are not sure. You can check the numbers at any time and you can continue playing after that. This short and funny game improves your concentration and visual memory.This version is the first release on CNET Download.com.