/vr/ - Retro Games

Doomsday zone.
I love that you must be Super Sonic, and you have to keep collecting rings to stay alive.
Also the fact that the boss itself is divided into three parts: the search, the battle, and the chase, making it more immersive.
The music is one of the most badass tunes in Sonic history.

This is from the times when the reward for completing a game at 100% was an awesome new final boss instead of an item that alters the gameplay or something like that.

Every Super Sonic final boss after Sonic 3K was a failure trying to imitate this.