The expanded weapon list includes weapons from Halo: Combat Evolved Anniversary that only enemies wielded, such as the powerful Energy Sword, the laser-spewing Sentinel Beam, the grenade-launching Brute Shot, and the bullet-spraying Sub-Machine Gun. It also introduces several powerful new weapon and enemy types that aren't in Halo: Combat Evolved Anniversary. Much like its predecessor, Halo 2: Anniversary is a movement-heavy, mission-based shooter that takes you on an intergalactic quest to save the human race. As a result, Arbiter can speed through areas and avoid being targeted far more easily than Master Chief. Master Chief and Arbiter have identical control schemes and weapons, with the only exception being that Arbiter also has Predator-style camouflage for discreetly navigating environments. This time around, the story also follows a disgraced Elite alien, who takes on the role of Arbiter to serve the Covenant elders as a covert assassin and lapdog as they search for Halos. Halo 2: Anniversary picks up where Halo: Combat Evolved Anniversary ends, with Master Chief and the marines celebrating their victory, only to have the alien Covenant crash the party with a small scale invasion.
