Considered a high-value purchase (the " Factorio Test "), often bundled at a significant discount.
: This is considered "mandatory" by many veteran players. It fundamentally changes the late-game from a single massive asteroid to a multi-asteroid cluster, introducing rocketry much earlier and adding radiation mechanics. New Mechanics & Content : File: Oxygen.Not.Included.v526946.Incl.ALL.DLC....
Some players report improved performance in the DLC cluster maps because each individual asteroid is smaller than the vanilla world. Considered a high-value purchase (the " Factorio Test