High Quality Content by WIKIPEDIA articles! 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.