Well, what do you mean? Do you mean, say, there's a neutral flag on the map and when you grab it a timer starts, and the first team to hold onto it for, say, 2:00 wins?
You might be able to do that. The only problem is, this would have to be done in an attack/defend style game. On team would try and possess the flag, the other team tries to stop them for having possession. I would have outputs on the flag entity that point to a team_round_timer:
And on the team_round_timer has an output thats point to a game_round_win entity.
Another way is to have the flag point to a logic_timer that points to a math_counter(which adds the time). When the math_counter reaches it's full count, it activates a game_round_win entity to the attackers. The team_round_win entity points to another game_round_win of the defenders.
Anyway, that's just off the top of my head. There might be a better way of doing it.
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