Custom title screen sound
Hold [Down] + [Y] at the title screen and record any sound into the microphone. The recorded clip will play during the introduction music. To preview it, press [Down] + [X] at the title screen. To hear it slower, press [Down/Left] + [X] and to hear it faster, press [Down/Right] + [X] at the title screen.
Credits sounds
Touch the Sega logo during the credits to hear the classic "Sega" sound. Touching other text and images that appear will result in other sounds. After the credits and theme song ends, touch the person sleeping in the audience to hear him snore.
Opening sounds
Touch the girl in various places at the mode selection screen and she will scream.
Bonus hairstyles
Have one of the following Game Boy Advance in the cartridge slot along with the game to unlock a new hairstyle in Maniac mode.
Sonic Advance 1: Sonic hairstyle
Sonic Advance 2: Sonic hairstyle
Sonic Advance 3: Chao hairstyle
Sonic Battle: Ulala hairstyle
Sonic Pinball Party: NiGHTS hairstyle
Puyo Pop: Puyo hairstyle
Chu Chu Rocket: NiGHTS hairstyle
Space Channel 5: Ulala's Cosmic Attack.
Alternately, complete the game under the hell difficulty setting
to unlock all bonus hairstyles.
Body 2 and 3
Successfully complete story mode under the normal difficulty
setting.
Alternate girl costumes
Find all the hidden rabbits.
Girl without top
Enter the DS system language option and change it to
"Japanese". The girl on the menu screen will no longer
have her top.
Alternately, complete the game under the hell difficulty setting.
Sound test
Successfully complete story mode under the normal difficulty
setting.
Hard difficulty
Successfully complete story mode under the normal difficulty
setting.
Hell difficulty
Successfully complete story mode under the hard difficulty
setting.
Birthday greeting
The girl will greet you by saying "Happy Birthday"
at the main menu on the date that you entered as your birthday
in the system settings.
Holiday greetings
Set the system date to December 25, January 1, and
other holidays to hear a new greeting.