At the "free mission" screen, (any difficulty, it doesn't matter) you need to complete all the missions. When that's done, the "SP" mission should have a little dash in the box select it and play.
Chat with our AI personalities
there isn't a answer
To unlock Zero in Super Smash Flash, you have to beat Adventure Mode on at least Normal Difficulty without getting a Game Over as Megaman.
You beat heroes mode on story
It's actually pretty simple. You have to unlock 3 capcom characters arcade mode endings. Then he's unlocked.
Really Easy, you unlock SCR-HD in free race after you have beaten the Babylon storyYou unlock SCR-GP by beating the Babylon Story