Radius
Use the left and right arrow keys on your keyboard to ram the circles in to each other. If you click on a circle, it will cause it to stop moving. Ram the required number of circles together within the allotted time limit in order to advance forward on to the next level. Bonus points will be awarded to you for ramming into a stopped circle, and even more bonus points will be awarded when two circles of the same colors collided with each other! Use all these tricks to your advantage to ensure that you wind up with a high score in this fun and highly challenging game.