Eternal Engine

Eternal Engine is the thirteenth stage in the Hero storyline of Sonic Adventure 2''. The player controls Tails. ''It's the heroes' first venture inside ARK.

Plot
Tails’ mission is to navigate through ARK and find the colony’s power generator and destroy it. Even though he’s successful, the remaining ARK stages don't appear to show any signs of it, with fully functioning machinery.

Layout
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 enemies and badniks.