From Sonic Retro
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|Sonic Adventure 2|
|First dark storyline level, Sonic Adventure 2|
|Level theme: industrial|
|Mission 1: Get to the core of the military base!|
|Mission 2: Collect 100 rings!|
|Mission 3: Find the lost Chao!|
| Mission 4: Reach the goal within|
4 minutes 0 seconds!
|Mission 5: Clear Hard Mode!|
|Dry Lagoon →|
Eggman accidently discovers about a top-secret weapon called “Project Shadow” on his grandfather’s, Gerald Robotnik's, journal. Thinking that Dr. Gerald is the greatest scientific mind of the world, Eggman thinks it’s a waste of good research not taking advantage of it. With this in mind, Eggman sets off to the GUN military facility, which is where the mysterious project is according to the diary.
Iron Gate is located inside GUN’s base in Prison Island and it has a military building theme, with security doors that block the way.
The major gimmick of the level is the security doors, which will lock in four different places, but busting them will open the doors.
Other level specific objects include computer panels on the walls, yellow and black markers, red arrows indicating the way, rotating red lights, yellow circular beams, elevators that access different levels of altitude, security cameras, small blue and giant yellow pressure tanks that can be destroyed.
Iron Gate is divided into five major sections, each a numbered level.
Eggman starts at Level 1, after busting the corresponding first doors open in the previous cutscene. In this section, the GUN robots are in Level 1 defense formation: Intercept intruder mode. The location starts with a long tight hallway and at the end, there’s another Level 1 door. After this, there's the first Point Marker and two rooms connected by a hallway beyond them there's another hallway, with the Level 2 door at the end.
After the Level 2 door, there is a shaft with a large elevator that will transport Eggman to a lower position, where another Level 2 door is, leading to a tight hallway that leads to the second Point Marker and another Level 2 door. Past this there's room, where item boxes are in the middle. There’s a hallway to the front hidden by yellow pressure containers, that leads to Eggman’s Laser Blaster and there’s a hallway to the right, with the Level 3 door at the end.
Continuing from the Level 3 door, the speaker will note that Eggman has breached section 3 to 8, and he’ll be in a large room. To the front and over a cylindrical tube, there’s a spring, which will lead to the Mystic Melody and from there to another large room, which is the same as the Switch room of Rouge’s Security Hall, although mostly empty. Back to the room below, to the right there’s a trail of platforms that will lead to a bridge of some sorts, then another hallway, a second bridge and at the end there’s the third Point Marker, along with the Level 4 door.
After the Level 4 door there is shaft with another large elevator that will transport Eggman to a lower position, where another Level 4 door is, leading to hallway and to the Level 5 door.
Continuing from the Level 5 door, the GUN robots will switch to emergency defense mode and the a warning that the final security door will lock. There’s a room with Gun Hunters that will hover to Eggman to attack, then another Level 5 door, another room and another Level 5 door and then to a larger hallway, with a missile console system and the final security door, that will lock down as Eggman approaches it.
Iron Gate shares some of it’s setting and level objects with Tails' Prison Lane and Rouge’s Security Hall, including the whole Switch room layout but empty, which isn’t surprising since they’re all located inside GUN’s military base. It should also be noted that the Iron Gate's defenses are higher and that it takes takes place underground.
- Beetle series: Mono Beetle, Gun Beetle (Normal Mode), Gold Beetle
- Hunter series: Gun Hunter (Normal Mode), Laser Hunter (Hard Mode)
- Hawk series: Mono Hawk (Hard Mode), Gun Hawk (Hard Mode)
- The level specific animal (third Chao container) is a Dragon.
In the first elevator shaft, stand on the bridge before the Level 2 door. Big is to the left, down in the shaft and hanging to the wall. Jumping will allow a closer look, but Eggman will die.
- Level 1: In the first room after the first Point Marker, on a ledge.
- Level 3: Amongst wooden containers in a side ledge, located just before the third Point Marker and Level 4 door.
- Level 5: On the goal room, to the south.
In the first elevator shaft, at the end of it to the right.
Beyond the Level 3 door, there is a cylindrical tube with a spring. Hover to it and jump to the platform to the right, follow the trail of rings and activate the ancient ruin. Hit the spring and let go of the pulley at the top, go to the right hallway, activate the second ancient ruin and follow the ancient ruin platforms to the higher platform.
Eggman's Laser Blaster upgrade can be found in this level - though the Large Cannon is typically a prerequisite to finding it. It’s in a hallway, located at the north of the room after the second Point Marker, hidden by yellow pressure containers and after them, a set of six steel containers.
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|Main article: Sonic Adventure 2/Comparisons/Iron Gate|
|Sonic Adventure 2|