Nintendo Game Boy
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Strategy Guides.
When you turn on your Game Boy Advance - hold A+B at the same time to see
an intro from the Famicom Mini version, which is Mario and Luigi
fighting over a lightbulb. If you press B again you will get to the
loading screen from the Famicom Disc system, all of which were just
added as an easter egg for the GBA version that you can not normally see
on this game.