Cannon's Core

Cannon's Core is the final stage of Sonic Adventure 2. In this stage, all the characters (with the exception of Shadow) work together to get the Master Emerald to the Core of the ARK. First, Tails and Eggman must destroy the security doors to let the others reach the chamber above the Eclipse Cannon. Next, Rouge must drain the liquid from the core so Knuckles can open the final security door. As Knuckles, swim to the switch and push it to let Sonic boost on to the core. Afterwards, Sonic and Knuckles reach the Core, only to find the Ultimate Life Form's Prototype. Shadow, influenced by Amy, volunteers to destroy it while Sonic and Knuckles reach the altar.