There are two little Quarks battling against each other by trying to control as much subnuclear matter as possible. Click on a field to gain control of it and place a bit of subnuclear matter. Once the particle gets too big, it becomes unstable. The next click on it starts a nuclear reaction. The one who caused this explosion gains control of the surrounding fields. Watch out for chain reactions! They can make you victorious or they can cause your downfall.