You can only get Sonic and Blaze in Sonic Rush.
You don't need to unlock knuckles in super smash flash.
knuckles is not playable in super smash flash 2 but sonic and tails are
Knuckles does not appear in Super Smash Flash 2 (v.0.8) but he is expected to be a playable character in the full game.
you have to unlock knuckles by beating tails with sonic 2 times with out looseing 5 lives
Go on how to unlock all characters in super smash flash
Knuckles is not in melee.
tell me some ways to unlock cloud on super smash flash
Complete tails in Classic mode and Knuckles in Adventure mode and Classic mode.
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 :-)
Clear 3-minute Melee with any character to unlock Crono in Super Smash Flash.
how to unlock Yoshi on super smash flash 2