Boss Mode is already exclusive to the Xbox One version of Plants vs Zombies: Garden Warfare. But the class-based multiplayer shooter is also locking off a common feature exclusively for the Xbox One version: split-screen co-op.
Co-op is essentially horde mode, as it puts two players against increasingly difficult waves of zombies. Every few waves, players will have to deal with bosses, determined by a slot machine. "If you are lucky you may get a bonus, but it will usually be a variety of powerful zombies that will take everything you have to defend against," EA explained in their blog.