Collider is a new physics based game by Dan Russell-Pinson, where you need to remove all charged particles from level. You do this by crashing positively charged particles into negatively charged ones, and vice versa.
You start each level with a few particles in your pocket – place these using the mouse, click Play, and let gravity do the rest. Click Rewind if you’ve made a mistake. There are 25 levels with some great, spacey music.
Get particle-smashing with Collider at Kongregate.