[captainjohn]

Will it be possible to do this?
There will be different attack/defense modes such as Area 69, Jefferson Motel etcetera.

So there will be a checkpoint in each map, the attacking team should stay in the checkpoint for like 45secs and the other team should defend it. The defending team win by killling all ennemies or by saving the checkpoint for 6 minutes
The attacking team wins by staying in the checkpoint for 45 secs or by killing all the enemies.

[Kyle]

Nothing is impossible.

This is pretty simple.

gettickcount and variables will help with this.