Tremulous is a fps which uses the Quake 3 engine where 2 teams can be chosen, humans and aliens. The two teams are able to build structures with buildpoints, which are vital to obtain victory. The goal of Tremulous is to eliminate the other team with all their spawns.
But Tremulous is not a fps like the others... The two teams are totally diffrent ( logic, aliens and humans ) but especially, having to build a base and protect it, allows an important strategic plan in the game for each team.
During a match of Tremulous, each team is at one of the three stages of development. These stages are achieved when the entire team exceeds a specific number of enemies killed. Each new stage unlocks new weapons, new upgrades or new structures. If a team reaches a higher stage than the other team's stage, they see their chances of winning increase significantly.