Galactic Simulator is a clicker game based on the Fermi Paradox and the Great Filter theory. Players can simulate the evolution of celestial bodies and civilizations in the galaxy from an observer’s perspective.

Fermi Paradox: As of now (2025), there is no reliable evidence to suggest that extraterrestrials have visited Earth. — “Where are they?”

Drake equation: N = R* × Fp × Ne × Fl × Fi × Fc × L

• N：The number of detectable extraterrestrial civilizations in the galaxy
• R*：The rate of formation of stars in the galaxy
• Fp：The fraction of those stars with planetary systems
• Ne：The number of planets, per solar system, with an environment suitable for organic life
• Fl：The fraction of those suitable planets whereon organic life appears
• Fi：The fraction of life-bearing planets whereon intelligent life appears
• Fc：The probability of a civilization emitting detectable signals
• L：The lifespan of a civilization

The Drake Equation helps us understand the probability of extraterrestrial civilizations existing. Galactic Simulator implements all the components of this formula.

The Great Filter: The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. According to the theory, Galactic Simulator defines the following Great Filters (evolutionary stages):

• Suitable stellar systems and potentially habitable planets
• Organic molecules (e.g., RNA)
• Prokaryotic cells
• Eukaryotic cells
• Multicellular Organism
• Intelligent Organism
• Tribal Stage
• Civilizational stage

Civilizations have a probability of failing at various stages of the Great Filter.

Civilization Levels (Kardashev Scale): Once a planet reaches the civilization stage, it begins to develop its level of civilization, measured by the Kardashev Scale.

Unique Planets: Each planet has its own unique appearance and is fitted with real-world physical data.