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Video games have objectives. These objectives tend to boil down to about six basic goals, and several variations and modifiers. These are those objectives.
Common objectives include:
Escape, or get to the exit. ("Escape from the prison.", "Find a way through the tunnel.")
Go to point A. ("Get to the chopper!", "Find Roger and tell him about the crashed chopper.")
Go to point A, and interact with X in particular manner. ("Plant a bomb on the structural support", "Listen in on the conversation between Those Two Bad Guys, making sure not to alert them to your presence.")