Cosmic Supremacy is a free tick/turn-based massively multiplayer space strategy game with a 3D interface. It belongs to the category of the 4X strategy games, being inspired by Master of Orion, Civilization, and similar games. You need to explore the galaxy around you, colonize new planets, expand your empire, research new technologies, design your ships and build your fleets, and finally establish contact with other players, with whom you can sign military or trade treaties, or engage them in battle.
The gameplay is a mix between traditional multiplayer strategy games and persistent online games. A game in Cosmic Supremacy exists in its own completely separate galaxy. Every Galaxy has a definite start, and ends when there is an obvious winner. Galaxies usually last between 3 and 6 weeks, with ticks speed that usually ranges between 30 minutes and 2 hours. The game keeps on running, even while players are not online. To ease the management of the empire and reduce the time to spend online while still being competitive, players can assign programmable governors to their own planets, and admirals to their fleets, which will follow the orders given by players while they're not online.
Beside normal galaxies, there are also Speed Galaxies, with very short turns and that reach their conclusion usually in a couple of days, such weekends, and Team Galaxies, where players are assigned to two or more teams, and where communication and coordination of the strategies among players are obviously more important.
The game is played with a small downloadable client.