Keep the circles on the platform for as long as possible to get the highest score. Use the mouse to move the circles. The circles will move towards the edge of the platform at a slowly increasing speed. The more circles there are and the faster they're moving the more you'll score. If any circle falls off the platform, you;ll lose the game.
I really made this as a break from all the 3D stuff I've been failing to do lately. This idea from this game was wholeheartedly ripped off of a minigame in Lego Starwars I believe, though it may have been from elsewhere. Please note that the cloud variable for high score is almost certainly not working, I suspect (hope) it will fix itself :D Also it bugs a lot in full screen mode, not sure why and any help appreciated.