America Oudan Ultra Quiz [Model DMG-UQJ]

Easter egg:
At the title screen, press B + Select to make the animated plane's picture little bit smaller. The meaning of this is unknown, but there are no other effects of this.

Mini-game instant win:
After the qualify stage, when you play the Rock-Paper-Scissors mini-game in Narita Airport, hold Down + Select + Start before or immediately after A is pressed to instantly win the current round.