Sins of a Solar Empire

Sins of a Solar Empire is a science fiction real-time strategy computer game developed by Ironclad Games and published by Stardock Entertainment for Microsoft Windows operating systems. Sins is a real-time strategy (RTS) game that incorporates some elements from 4X strategy games; promotional materials describe it as "RT4X." The game was released on February 4, 2008, its first content expansion titled Entrenchment was released as a download on February 25, 2009, and its second content expansion titled Diplomacy was released as a download on February 9, 2010. A package that combines the original game with the two expansions was released at that time with the name Sins of a Solar Empire: Trinity.

The playing field is a 3D web of planets and other celestial objects in the orbital plane of one or more stars. It features a sandbox mode, allowing the player to choose different types of solar systems to unlock achievements. Players can conquer neighboring planets and explore distant star systems in a "massively scaled, fully 3D environment featuring entire galaxies, orbiting planets, clusters of asteroids, space dust and radiant stars." Notably, there is no single-player campaign mode, but games can be played against opponents offline and other players online.