Even though I tried every possible code in the password system, there wasn't any codes for these Extra Battle Stages 11 & 12.

To unlock the two Secret Battle Stages, you must constantly press the X button anywhere on the Main Menu Screen, for approximately 8 seconds, until a sound is made.
It doesn't matter what you highlight (Password, Battle, etc.) or how many times you put the code in.

Plus at the end of the video is the complete list of all 118 passwords.

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