Iron Gate

Iron Gate is the first level of the Dark Story in Sonic Adventure 2. It is exclusive to Dr. Eggman.

Overview
When Eggman blows into the HQ on Prison Island, the security systems try to block him off by closing all the metal security doors, which must be destroyed in order to pass through. The goal is to destroy the G.U.N. robots and penetrate the entire base. Throughout the level, the security system will alert enemies to Eggman's presence by announcing the level he is on. The security of the level gets tougher depending on the security level Dr. Eggman is on.

The level ends when Dr. Eggman finally succeeds in penetrating the base and finds his grandfather's project code named Project Shadow.

Stage Layout
The layout of Iron Gate is basically the same process with new twists when a new room is entered. Most of the time, the player must try to shoot locks off doors or destroy enemies while on moving platforms. Iron Gate gives the player an impression of what future levels are like.

The Iron Gate looks similar to Tails' Prison Lane level, since the two stages take place in different areas of the prison.

Upgrade
Eggman's Laser Blaster is found here.