Castle Crashers is a 2-D action/side-scroller game independently developed by The Behemoth. The game is only available over Xbox Live and can be purchased for 1200 MS points through the Xbox Live Arcade.Xbox.com: Castle Crashers Game Details

One of the main gameplay features in Castle Crashers is the Animal Orbs. The Animal Orbs are collectible items that award the player with a companion animal to assist them in battle. Different animals have different effects. For instance, the Seahorse helps you move quickly through water, while the Bitey Bat—as its name implies—bites and attacks enemies. The Animal Orbs are collected from bosses, discovered in hidden areas or purchased from stores.