Mystic Realm

Mystic Realm is a level pack by Mystic. It originated in the very early days of SRB2, eventually growing into a large-scale level pack with seven main zones, various hidden levels and an original soundtrack that has since been incorporated into the game proper. All of Mystic Realm's main game was ported to SRB2: TLL. It is unlocked by beating Aerial Gardens Zone 5.