In Terraforming Mars: Ares Expedition - Crisis, you play as corporations, just like in the original Ares Expedition. You choose phases and play project cards as usual. The difference is that you work together to keep Mars habitable after a natural disaster has brought the planet into crisis.
In each round, a new Crisis card is drawn, which will require you to meet a specific goal that can remove the crisis from the game. Each time a Crisis card is not removed, it will lower one or more of your terraforming metrics that keep Mars habitable.
Handle all crises as they arise. Eventually, a Crisis card will be drawn that allows you to win the game when you have completed the re-terraforming of Mars.
See our full selection of Terraforming Mars games and expansions here.
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