Red Mountain

Red Mountain is a stage in Sonic Adventure and Sonic Adventure DX: Director's Cut. It is a stage connected to Angel Island in the Mystic Ruins(an adventure field) and is a stage playable for Sonic, Knuckles, and E-102 Gamma.

Overview
The mountain has many metal bridges, some that brake very easily, and many parts are filled with ladders and many zip-lines. There are also many blue robots with flying blades. Note that there are many parts with spiky black balls that must be avoided at the first part of the level(which can be a little tricky), giant hammers and much fire and lava at the second part of the level. Never the less, this is a more tricky stage.

Sonic
Sonic's version is the longest version of the stage compared to Knuckles and Gamma. The first part is on top of the mountains, the second part being inside the volcanic mountains, and in the end, finally coming back up to surface. Right after Sonic finishes the stage, he finds Tails in his new version of the first Tornado; the Tornado 2, and he hops on board to go and chase the Egg Carrier. This was in fact Sonic's goal, for he was chasing the Egg Carrier, and that was the whole reason for the stage.

Knuckles
Knuckles's version is only the first part of Sonic's version, and the reason Knuckles is here is the cause of looking for the Master Emerald shards. The difficulty is much the same as it is in Sonic's version, only shorter(unless it takes you forever to find the master emerald shards, that is).

E-102 Gamma
Gamma's version is probably the shortest of the three characters. His goal in this stage is to destroy one of the E series robots.