hey guys, yesterday only my bro told me about one fantastic online game, GRAVITY-MASTER. In this game all you have to do is to collect all rotating circles with the black ball for which you'll need some basics of gravity.
You can move the ball by drawing shapes with mouse and using physics. If we can apply greater imagination then we can complete each step in lesser time. Other instructions and rules are given in the game. here is the link for the gravity-master game. www.gravitymaster.net
I liked it very much hope you'll also like the game! Enjoy!