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There are 16 milestones in Surviving Mars (not to be confused with Achievements). Each Milestone achieved grants Research points and Score and accessed by the circle-with-a-dot button at the bottom right of the screen.
Score is determined by the Sol when a Milestone is achieved. Full Bonus Score added in first Sol and decreases evenly to zero up to Bonus score expiration. It is then multiplied by the Difficulty Challenge percentage, which is determined by the starting map settings.
In Space Race only one colony can achieve a Milestone. Rival Colonies can be delayed from achieving Milestones through Covert Ops.
Base Score 1000
Bonus Score 1000
Bonus score expiration (Sols) 10
Reward Research 250