this mechanism requires players to select individual actions from a set of actions available to all players. Players generally select actions one-at-a-time and in turn order. There is usually(*) a limit on the number of times a single action may be taken. Once that limit for an action is reached, it typically either becomes more expensive to take again or can no longer be taken for the remainder of the round. As such, not all actions can be taken by all players in a given round, and action “blocking” occurs. If the game is structured in rounds, then all actions are usually refreshed at the start or end of each round so that they become available again.