The best Sandbox Game alternative to Oxygen Not Included is RimWorld. It's not free, so if you're looking for a free alternative, you could try Dwarf Fortress. If that doesn't suit you, our users have ranked eight alternatives to Oxygen Not Included and three of them are Sandbox Games so hopefully you can find a suitable replacement.
RimWorld follows three survivors from a crashed space liner as they build a colony on a frontier world at the rim of known space. Inspired by the space western vibe of Firefly, the deep simulation of Dwarf Fortress, and the epic scale of Dune and Warhammer 40,000.
Dwarf Fortress is a single-player fantasy simulator. You can control a dwarven outpost or an adventurer in a randomly generated, persistent world. The world is procedurally generated with distinct civilizations spanning centuries of detailed history, multitude of towns, bodies...
Clanfolk is a challenging medieval colony sim that takes you to the Scottish Highlands and pits you against nature itself. Starting with an empty plot of land and only your closest family, you will learn to survive as you establish your hearth and home, watch over your...
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