Level select:
Press II, I, II, II, I, II at the title screen. Then, hold Select and press Run. A level selection option will now be available. To access levels 4 to 6, hold Select while the level selection option is highlighted.

View messages:
Press II, I, I, II, Select, Run or I, II, II, I, Select, Run at the title screen to view two different messages.

Sound test:
Hold Select and press Start at the title screen. A sound test option will appear on the main menu.