About This Game

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.

Game Controls

If you're unfamiliar with the above theoretical background, don't worry—the game isn't complicated. There are only a few key click actions, and it provides detailed explanations and auto-completion options.

Even without any player input, the galaxy will evolve over time on its own.

Tips on in-game camera controls: WASD to move, Q/E to rotate, Z/C to zoom

Game Modes

• Casual Mode：The success rate of most in-game events and the Great Filter is set to 50%.

• Realistic Mode：More realistic probabilities and data to simulate the real world.

Multiplayer and Leaderboards

• The game supports multiplayer mode. Create a unique galaxy with friends!

• Supports leaderboards, letting players worldwide see your unique planet.

About the Demo

The demo version of Galactic Simulator: Great Filter is now available for a limited time!

Enjoy single-player casual mode—try it now! (Multiplayer and some features are not supported in the demo version.)