The Mystic Realm
From SRB2 Wiki
The Mystic Realm, more often called Mystic Realm for simplicity is a level pack for use with Sonic Robo Blast 2. The current version includes thirty levels to expand Sonic Robo Blast 2. It also includes a completely new soundtrack and hidden zones for obtaining the Chaos Emeralds. Mystic Realm is very popular in the Sonic Robo Blast 2 community due to the large and complex maps that add much more gameplay time. People like to hold race and coop netgames using the Mystic Realm. Match is also semi-supported, as there are weapon rings placed in the levels.
Levels
Mystic Realm has 93 maps, many of which are duplicates. There are seven main zones with three acts, an emerald stage for each zone, and two hidden zones for Sonic if he gets all the emeralds on Normal difficulty or higher. There is also an archives section with older versions of the stages. In addition, there is the Second Quest, which contains a duplicate of the main game with different texturing, different Mystic Temple locations, and some enemy modifications.
Emerald Collection
Mystic Realm has a unique method of collecting the Chaos Emeralds. To collect an emerald, find the Mystic Temple in the second act of any main zone, and step on the center. Complete the stage and you will be taken to an emerald stage, where the emerald lies near the end. These are normal, one-act zones otherwise, and once inside an emerald stage, it's not possible to leave until it is completed. Make sure to collect the emerald at the end of the stage, as it's possible to not collect it.
