Particle Accelerator is an educational dexterity game for 1 or more players. Particle by particle, you must create (in order) hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon, by flicking protons, neutrons, and electrons into the atomic structure. At every step of the way, what you create must be a stable isotope (although it could be an ion), with electrons in the correct electron shells, or — BOOM! — nuclear meltdown, game over.