Fun With Attractors (Fun)
This time I will propose something different, games in which you can have some fun with gravity.
Here and here you can find two flash games(?) where you can play with gravity (no purpose - very addictive)
If you want something that looks more like a game, go and download Strange Attractors by Ominous Development.
In this game everything is controlled with a single button that toggles in the influence of gravity between your ship and everything else.
Have fun :-)
Edit: For more physics games check this excellent site Fun-Motion