Marine Doom was created in 1996.
duke nukem
Devil Doom is located in Central City. Once Devil Doom is spotted floating above the read mist on ground, the first attack can use shadow arrows or by spitting a wall of fire at him.
Beat every stage and boss to reach the final story, and beat it. Devil Doom is the final boss.
It is the same, only from another Marine's view.
To face Devil Doom on Shadow the Hedgehog you need to unlock the Last Way stage. To unlock The Last Way you need to have gone through all the possible paths in the story and seen all the other endings. Devil Doom is the boss you face after completing The Last Way.
In shadow the Hedgehog, you need to beat every level
beat every story boss and vs devil doom you are super shadow beat every story boss and vs devil doom you are super shadow
You have to finish the regular story mode.
beat the last story (after you fight devil doom)
Closest you can get to it is the version playing at Devil Doom.
You would find a Doom painting in a Medieval church