Hey all right basically I am trying to remember the name for a game that my brother used to play so I can get him it as a present.

The game as I can remember it was a first person shooter where you were in an arena at the start like a kind of mercenary, and the better the kills or the bigger the thing you kill the more money you got to up your gear and weapons. Also during each mission you needed to pay to get ammo and so on.

After a while of play you also decided to be on the side of the rebels or the bad guys for the remainder of the game.

Unfortunately that is really all I can remember about it other than it is quite an old one.

Any ideas would be epic.

Thanks in advance