You can unlock shadow on super smash flash by duing adventure with sonic,Tail and Knuckles. P.S [ Use sonic last not tails].
No,but you can unlock super sonic
Shadow is not a playable character in Super Smash Flash 2 (v.0.8b) yet he is expected to appear in the full game, with Super Shadow being a form utilized as his Final Smash.
You can't unlock Shadow the Hedgehog in the Super Smash Flash 2 Demo. That function is only available to those who get the whole game. In the game, one has to complete a number of tasks to unlock Shadow the Hedgehog.
Go on how to unlock all characters in super smash flash
There is no way you can unlock wolf in super smash flash
You don't need to unlock knuckles in super smash flash.