Pressure race! See which particles cross the finish line faster than others.
@Poorsoft yeah you just place the fan block, then hold shift, click the fan block and drag in the direction you want it to blow...
you program? cool. the thing looks cool too, the accelerator. do you know how to use the blue thing for acceleration?
This is the product of being very bored in Programming class... put elements in to see them go flying around. The "reactors" in the middle don't do anything but they look cool :D