Couple of more comments to add, because I think with a few touchups, this can be a perfect game. More simultaneous players (computer or human) is a must. Also, instead of having the wind be a negative figure, you should show an arrow (left or right) and simply a magnitude. Finally, instead of repetitively and unnecessarily asking "Play again? Yes or no", you should just start the next round and leave it to the user to quit out if he wants to by simply hitting Escape.