Iron Gate

This is the first level of the game Sonic Adventure 2 in Dark Story. It is a shooting level so it is exclusive to Dr. Eggman.

Overview
When Eggman blows into the HQ on Prison Island, the security systems going off and try to block off the enemy by closing all metal doors, but are very easy to brake 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 you are on. The level ends when Dr. Eggman finally succeeded to penetrate the base and finds his Grandfather's (Gerald Robotnik) project code named Project Shadow.