Each base has a large skull, and the object of the game is to destroy the opponents skull with your firepower. Not as simple as it sounds. This requires massive teamwork, it cannot be done by one man, unless of course the opposing team really sucks. With each hit you make on the skull, the skull lights up with a certain amount of points, these are health points that you are taking away from the skull. The skull has a total of 2500 health points and regenerates 1 point with each second.
Overload has great gameplay and is extremely fun.
The last mode that is installed with Team Arena is Team Tournament. A simple and easy mode of play, it is 1v1 deathmatch. That's it really, nothing special about the mode, but it does get you ready for the annual Quake Championship, that is the only purpose I can think of for this mode, a true test of battle, 1v1. Rocket Arena, the Q3 MOD, is what most Q3 players use for 1v1 deathmatches. This MOD is perfect for honing your Rail and Shotgun skills.