Sonic News Network

Know something we don't about Sonic? Don't hesitate in signing up today! It's fast, free, and easy, and you will get a wealth of new abilities, and it also hides your IP address from public view. We are in need of content, and everyone has something to contribute!

If you have an account, please log in.


Sonic News Network
Sonic News Network
Main page Gallery

Shadow... This is the last stronghold of the human army. Destroy the core of the base, and then this planet will be completely defenseless!

Black Doom, Shadow the Hedgehog

GUN Fortress is one of the sixth Stages in Shadow the Hedgehog. It is G.U.N.'s top-secret base and can be reached by completing the Dark mission of either The ARK or Air Fleet.


Built in a series of underground caverns, the GUN Fortress houses the three Mother computers that coordinate those remaining forces resisting the Black Arms invasion with replenishing GUN with dozens of GUN Troopers, Giga Troopers, and Big Foots. In addition, it is armed with surveillance cameras and an immeasurable number of GUN infantry and machines. It is located in a mountain near the sea.


If Shadow has completed The ARK's dark mission and deactivated Space Colony ARK's defenses, the Black Arms take advantage of the opportunity and seize control of the Eclipse Cannon. After Black Doom telepathically broadcasts a speech demanding the surrender of Earth's forces, the Eclipse Cannon is fired at Central City to demonstrate the power that the Black Arms possess. Nothing is left of the United Federation's former capitol but a smoldering crater, though all of its residents have been safely evacuated beforehand.

If Shadow has completed Air Fleet's dark mission, the President barely escapes the would-be political assassin Shadow the Hedgehog. The rather flustered leader is taken to the deepest part of G.U.N.'s subterranean headquarters, where the Commander assures him that their forces will rally. Unfortunately for the humans, over one thousand alien invaders have managed to breach the fort's outer defenses, including Shadow.

Either way, things aren't looking so great for humanity in their struggle against the Black Arms. G.U.N., the only real competent defense force left on the whole of Earth (Eggman included) capable of fending off the Black Arms, has been reduced to barricading what remaining forces it has at its center of command where it can keep resupplying its mechanized forces quickly. Shadow is tasked by Doom's Eye to destroy the three mother computers which churn out G.U.N. robots. Taking an uncharacteristic change of heart, Rouge the Bat is determined to prevent the Black Arms from swiping the last Chaos Emerald that lies at the end of the base. It's your choice whether to aid Doom's Eye or Rouge.

Helping Rouge and allowing GUN time to regroup results in Black Doom confronting Shadow in person over his last minute betrayal, while helping Doom's Eye in crushing the last bits of human resistance leads to where Shadow is confronted by the GUN Commander in person in the incomplete Diablon alongside a furious Sonic, making a heroic last stand to stop Shadow and Black Doom at all costs.



The following weapons can be found in GUN Fortress:

Secret Key locations

  1. From the start of Stage, the Key is located on the left, just behind the large container.
  2. After using the pulley in the first large room, the Key is located to the right, between two large containers.
  3. In the second large room after getting the Jump Vehicle, go up to the second level past the pulley to find the Key sitting on the ground next to the barriers.
  4. Behind the second core, just after the fourth Save Point. This one is easy to miss, especially if going for speed.
  5. After using the pulley after the secret door, there is a hallway that Shadow can Triangle Jump to get past. The Key is at the end of this stretch.

The Secret Door can be found along the main route of the stage, just behind a Big Foot. Inside, there is a G.U.N. vehicle and a shortcut through the Stage with many Rings and 1-Ups. This shortcut also bypasses a difficult area before rejoining the main path that leads to the final mother computer and the Goal Ring.


Story Mode

Dark mission

Guide Mission Objective
Shadow the Hedgehog - Dark Mission - Doom's Eye.png Destroy the core of the base! Destroy the three mother computer in the GUN Fortress.

There are GUN turrets in all three mother computer rooms that are to be used to destroy the cores. If there are no enemies nearby, Shadow will automatically target the cores himself. By destroying all of the GUN Soldiers and mechs, the player will receive about 40,000 points in total, which is more than enough for an A-Rank. This makes it one of the few Dark missions where a time bonus isn't need to get an A-Rank.

Rank Score[1]
A Rank (Mini) (Shadow the Hedgehog).png ≥ 20,000
B Rank (Mini) (Shadow the Hedgehog).png 18,000
C Rank (Mini) (Shadow the Hedgehog).png 12,000
D Rank (Mini) (Shadow the Hedgehog).png 5,000
E Rank (Mini) (Shadow the Hedgehog).png < 5,000

Hero mission

Guide Mission Objective
Shadow the Hedgehog - Hero Mission - Rouge.png Find the Chaos Emerald! Reach the Goal Ring.

Shadow will be shot if the player stands still while the surveillance cameras are watching.

Rank Score[1]
A Rank (Mini) (Shadow the Hedgehog).png ≥ 18,000
B Rank (Mini) (Shadow the Hedgehog).png 13,000
C Rank (Mini) (Shadow the Hedgehog).png 10,000
D Rank (Mini) (Shadow the Hedgehog).png 5,000
E Rank (Mini) (Shadow the Hedgehog).png < 5,000

Expert Mode


  • The game's files refer to this Stage as "bas02," short for BASE while the 02 signifies it is the second G.U.N. base-themed Stage, with Air Fleet being the first, signified by its filename of "bas01."
  • According to Rouge, the electrified pools of blue liquid seen throughout the fortress is toxic waste. Doom's Eye also comments on it, saying that the contaminated stream will probably eat away at Shadow's "flesh and bones."


Name Artist(s) Length Music track
"GUN Fortress" Jun Senoue 2:21
N/A (2P battle mode) Jun Senoue 2:12



  1. 1.0 1.1 Kaizen Media Group (22 November 2005). "Stage Rankings". Shadow the Hedgehog: Prima Official Game Guide. Prima Games. p. 93. ISBN 978-0761551959.

Main article | Scripts (Main Story, Last Story) | Credits | Manuals | Glitches | Beta elements | Library Sequences | Gallery