Algodoo

Press enter to toggle the missile's main thruster. To steer down, press right; to
steer up, press left.

Everything's so big, and there're so many bricks in the scene that it
will take several seconds for the missile to start moving and/or start
responding to the steering keys. Once you get the hang of it, though,
it's a lot of fun to see how the tower collapses depending on where the
missile hits it!

Have phun!