Sudoku is a game that will exercise and exhaust your mind but how would you perform if you had a ticker counting down to zero at a rate that will alarm you? Sudoku Countdown is a challenging Sudoku game in which you are racing against a timer. First of all, for anyone who has never attempted Sudoku, you have a 9X9 grid which is divided into smaller 3X3 grids. Now the numbers 1 to 9 are supposed to go into the squares of the grids and you should not repeat any number. In the larger grid, the numbers should not appear again in the columns or the rows. This is the reason why you must have the mind of a mathematician to play the game. The game requires that you have a good memory so you can complete it in time. However, the game is quite easy at the start since most of the squares in the grid are already filled up. Getting to know which numbers are missing should not be too hard. So you get some reprieve from the ticker. You fill the grid by clicking on it. If you want to put number 1 you click on it once. If you want the number 6 you click on it six times. If you want to erase any of the numbers that you have added, then you have to click until the number disappears; usually after the number 9 appears. All the numbers that you fill will be in the white squares and the ones filled by the game are in the shaded squares; this will come in handy when you want to make a correction. You will be able to easily identify the numbers which you can change so you can proceed with them and leave the ones that you cannot change.