Algodoo

I like mechanical puzzles. Then I thought- why not make some on Phun?
I wanted to start the part of it on the forums before working on anything, so I just made a classic: the Jam It In puzzle. Here are the rules-
1. Get the cube to stay inside the box.
2. No adding fixates or hinges or springs.
3. Be creative.

So, it's simple yet hard, I guess, but I didn't want to do anything big until my big project was up in the forums.