Eternal Engine is the thirteenth stage in the Hero storyline of Sonic Adventure 2. This is Tails' fifth playable stage. It's the Heroes' first venture inside Space Colony ARK.


Immediatly after their shuttle crashes on the ARK, Tails reveals his plan: destroy the engine of the Eclipse Cannon and then have Sonic implant his fake Yellow Chaos Emerald into the computer room and destroy it. Tails' mission is to navigate through ARK and find the colony's power generator and destroy it so Sonic can place the fake Chaos Emerald in the Eclipse Cannon.


The primary gimmick in this level is that of dynamite hatches. Where as in other stages, dynamite is used to perform useful demolitions, shooting dynamite in this stage results in the creation of a vacuum field that attempts to suck Tails out into space from close range and succumbing to the field results in loss of life. The dynamite packs are also attached to platforms, which destroyed make the navigation much more difficult. Tails must avoid destroying these dynamite hatches. Tails also must destroy many G.U.N. enemies.


Tails' Bazooka upgrade is located here. It will allow him to break the steel containers.

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