Rimworld is a colony simulation game developed by Ludeon Studios, first released in early access in 2013 and fully launched in 2018, where players guide a small group of survivors building a settlement on a distant planet. Its opening theme plays on the main menu and has become closely linked with the start of a new run in gameplay videos, streams and fan edits. Because the game has kept a large, active player base and a steady stream of updates and mods, the quiet startup sound still works as an instant signal that another colony story is about to begin.