A mode of play in the excellent
FPS Unreal Tournament. I find this requiring the most
teamwork, even more so than
Capture the Flag.
The point of the game is to complete designated objectives. One team attacks the objectives (usually a switch, or a target to be destroyed) and a defending team tries to prevent the attackers from doing so in a set amount of time.
This requires team coordiantion, cohesion and tactics. If there was voice communication it would be even better, but it was not included (BTW, voice communication is planned to be included in Team Fortress 2. I can't wait). A split team is no match for a well-coordinated assault or defense.
This is one reason Unreal Tournament kicks Quake 3's ass back to the stone age.