In Axis, you play ARM, a mechanized warrior that can improve his ability to fight by changing parts and weapons. There are single player missions and massive multiplayer online battles to elect to play. The online battle mode features team death match, sudden death, and a rocket arena mode.
You can customize all your weapons in the ARM center. You must be careful of inertia though. You should not select body parts which are heavier than your body can handle. If you add parts that are too heavy, you may find that your robot moves very slowly and is highly unstable.