Algodoo

A medieval anti infantry weapon that fires iron bolts!

Up and down arrows to aim.
Press and hold enter to release bolt.

Press and hold enter.
Pull the black firing mechanism to the back.
Release enter to lock the firing mechanism.
Pull a bolt into the ballista till the back touches the black cross bar INFRONT of the firing mechanism NOT TOUCHING the firing mechanism.
Fire.

It doesn't fail that often and you can be quite rough with it.

Try and hit the Bobs at 10, 20, 40 and 150m.
Credits to EPR for Bob.

Have Phun!