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.
play one of the characters
No,but you can unlock super sonic
Go on how to unlock all characters in super smash flash
tell me some ways to unlock cloud on super smash flash
Shadow isn't in Super Smash Flash 2 yet.
Sorry. you can't unlcok him in super smash flash. But look somewhere if he is in one of the Super Smash Flash 2 versions and unlock him. Good luck :-)
Be tails and beat sonic with five lives 30 times
Clear 3-minute Melee with any character to unlock Crono in Super Smash Flash.