Algodoo

how to operate:
1. press the Right arrow key to let the projectiles pile in,
2. press enter to move the thrower and throw a projectile
3. wait until the projectiles that you haven't thrown are in a straight line, if needed, force them into a straight line yourself.
then repeat 2 and 3 repeatedly until you have used up all your projectiles,
then you can throw them back on and throw them and throw them again!