Click the atom, earn particles, evolve through all 118 elements of the periodic table. A free idle/clicker game with a deep skill tree, prestige system, and Steam achievements.
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First Contact98.5%
Make your first click.
Nuclear Fission97.1%
Purchase the Nucleus and unlock the skill tree.
Chain Reaction72.6%
Accumulate 1,000,000 particles in a single run.
Critical Mass69.2%
Accumulate 10,000,000 particles in a single run.
Supercritical67.3%
Accumulate 100,000,000 particles in a single run.
Meltdown65.7%
Accumulate 1,000,000,000 particles in a single run.