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 proceed to the core. Afterwards, Sonic and Knuckles reach the Core together, only to find the Ultimate Life Form's prototype, Biolizard. Shadow, influenced by Amy, volunteers to destroy it while Sonic and Knuckles reach the altar. This level features switches that freeze time, which are pretty useful for they can also freeze the clock for an easy A rank, and can be used infinitely. The switches also freeze, waterfalls, acid pits, and fast-flowing water, so they can be walked on; however, the switches only last about 10 seconds, and a beep will start to sound, when it starts to be repeated pretty fast, it's about to end, so you must be careful.