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Deathmatch:  Deathmatch is just trying to kill the other team.  There are automatic respawns, and it is relaxed.  The weapons don't cost anything and the only objective is to get kills, so you can practice your aim.

Arms Race:  Arms Race is a lot like GunGame.  You must kill people to rank up your weapon.  The winner is the player who gets a kill with the "Golden Knife."