Stretch you arm (only one, sorry) and catch those reckless green particles that are flying out of your green body! And push those nasty red ones to show them where they belong (as far from you as you can reach, apparently).
Fun ends when all green fall to their death (don?t worry, you can always try again). Survive as long as possible ? it means more points! (Don?t let the reds touch you ? they are bad and substract points.)
Try to have more than two particles at the time. Below this threshold the games gets ?nasty? and speeds up a little. The best strategy is to control number of remainning green particles ? less you have, less points you loose from hits.
The red particles are destroyed when they are out of the circle or you have made them move back few times (2-4 hits).