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The Battlefield stage is accessible in Super Smash Flash after you clear All-Star Mode as any character.
Play from an hour then do adventure mode.
In Super Smash Flash, clear Classic Mode with the 13 original characters to unlock Mr. Incredible.
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.
One way to unlock Luigi in Super Smash Flash is to clear Adventure Mode with Mario on Normal Difficulty or higher. Another way could be hacking.