A substantial 70% discount on the Steam platform is currently making Klei Entertainment’s critically acclaimed space colony simulation, “Oxygen Not Included,” available to a broader global audience.
The promotion reduces the game’s price to approximately $2.76 USD, according to pricing observed on November 24, 2025. This makes the intricate survival and resource management title significantly more accessible.
Players are tasked with overseeing a subterranean colony on an asteroid or other hostile environments, managing a crew of “duplicants” to ensure their survival against overwhelming odds.
Gameplay involves intricate systems for gas and water pipelines, energy, thermal control, food production, and waste disposal. A key element is the realistic simulation of gases and liquids, where factors like carbon dioxide accumulation and oxygen depletion pose constant challenges.
Developed by Klei Entertainment, the game officially launched on July 30, 2019, following a successful early access phase that garnered a strong community following.
Its distinctive 2D cartoony aesthetic belies a high level of internal complexity. The design prioritizes functional clarity over ultra-realistic graphics.
The game is known for a steep learning curve, as players must master deeply interconnected systems including electricity, heat, and expansion. Despite its depth, the hardware requirements are modest, requiring Windows 7 (64-bit) or 10, a dual-core 2 GHz processor, 4 GB of RAM, and 2 GB of storage.