Terraforming Mars

Can a blue card action be used several times in a generation?

Blue cards with actions can only be used once per generation (mark them as used with your player marker until the Production phase). If a card has more than one action, you must choose which one to use. Any cost before the arrow must be paid first, then the effect after the arrow is performed similar to when you play a card, and with the same restrictions, meaning you must be able to perform the effect in full, except for raising an already maxed out global parameter (oxygen, temperature, or ocean), removing opposing resources, or adding resources you can't collect. If you can’t perform the effect (or pay the cost), then you can’t take this action.