Question game timers

I was wondering what its called when a game has conditions that have to be met before you can complete the game or certain tasks, like lets say i have to get a flashlight and a gun before i can move on to the next level what is that called? i think its called a timer but im not sure, or maybe a conditional timer?
You can call it a precondition or prerequisite but I'm not sure how often these words are actually used in games. Maybe there is a better word.

A timer is something that measures time.
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An objective, perhaps?
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