 Within the initial game engine, "Fighter Maker", the game would only register two simultaneous button presses if they were within the same processing time frame, which would hinder gameplay.To work around this, the team designed a fourth button, (a "magic" button as described by Mane6), used to have the character remain still while doing a specific activity that would build up an EX meter, such as Twilight Sparkle reading a book.With a full EX meter, the player would then be able to execute special moves with any of the other three buttons.