The second the Sega logo appears, hold Start on Controller 2 and press Down, B, Right, Up, C, Left, A on controller 1 before the logo disappears. If done right, a sound will be heard. Keep holding Start on Controller 2 until the copyright screen appears. Now, let go of Start on Controller 2, and hold Start on Controller 1, then quickly press Up, A, B, Left on Controller 2. This time, there will be no sound. Also, the second part of the code will not work if you already have a saved game in the battery, and currently there's no way to delete a save.
Then, while playing: pause the game, go to Options, then Specials to access the complete debug menu.
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