Once you get past the pure numerical additions, the most obvious addition to the series is the new Titan. As you play through the game, killing enemies, completing goals and generally avoiding damage, you'll build up your Titan meter. Once it fills up, you can instantly mutate into a 15' tall Titan. The Titan has massive health, a decent shield belt and can fire homing rockets. Oh, and he can also pound the ground to knockback any enemies that get too close. In short, the Titan is a real game changer. But since both sides are able to obtain Titans fairly easily, it's not unusual to see at least a couple of them squaring off in any game. What is rare is seeing a Titan stay alive long enough to access the Behemoth mutation. This doubles the already ridiculous size of the Titan, but thankfully only lasts for half-a-minute.