Foundations er en udvidelse til spillet Terraforming Mars: Ares Expedition, og kræver altså dette spil.
Ares Expedition: Foundations contains additional player boards, cubes, and phase cards so that Ares Expedition can be played with up to six players.
This expansion also includes two additional game boards. One is a larger score track. The other adds a fourth terraforming metric: infrastructure.
Addtionally, there are new project cards that involve the new terraforming metric and a new phase card.