You need to unlock the 10 endings. Then you can unlock the final ending.
You have to complete all 10 storylines in the game.
Play the story constantly to get all 10 endings (when you have unlocked all the bosses) then you'll get last story.
Do the correct mission to play different levels in story mode. After 5 levels, there will be an ending. Play all levels to unlock the final boss.
You must clear all 10 finals.You will unlock the final story when you clear the stage you will face Devil Doom.In that battle you are Super Shadow.
11. There are 10 for the normal levels, and a final ending that is unlocked after seeing all other endings.
Theres unlockables, final story,
Complete 10 storylines to battle every final boss and that will unlock the Last Story.
The only time you can become Super Shadow in Shadow the Hedgehog is at the true final boss, at the end of "The Last Story", when you fight Devil Doom, the super form of Black Doom.
What level are you talking about?
You can't. Shadow is the only playable character, and in the final boss when you play as Super Shadow, there is no companion character.
Black Doom, the main antagonist, is the final boss of several of Shadow the Hedgehog's branching storylines. He is also the true final boss of the entire game, once you've finished all other possible endings.
You have to complete the main story line of Sonic's story, Shadow's story AND Silver's story. You don't need to do any extra town missions if you don't want to.