Stage Select +
On the Player Select Screen, press Up, Down, Down, Up, X, B, Y, A. If done correctly, the screen will flash. Select your player and press Start. The Mega Warp Zone screen will appear. Choose the stage you want.
Easy Way to Win Fights
Double press forward to make any character run. Run towards an enemy and press the punch button you can easily defeat bosses like Blag, Roper, and Shadow Boss and even The Dark Queen by doing this.