Feel the Magic: XY/XX, known in Japan as Kimi no Tame nara Shineru, and in Europe and Australia as Project Rub, is a mini-game compilation developed by Sonic Team's UGA Division and published by Sega for the Nintendo DS handheld video game console. It was first released in North America, and later in Japan, Australia, and Europe.

Feel the Magic: XY/XX is played solely with the stylus and microphone, and features a voice recognition system through both speaking and breathing. It is similar to WarioWare: Touched!, as it is composed of several minigames that are loosely linked, as the player tries to impress the girl.
(Wikipedia)

UNLOCKABLES

Credits sounds
Touch the Sega logo during the credits to hear the classic "Sega" sound. Touching other text and images that appear will play other sounds. After the credits and theme song end, 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: Ulala hairstyle

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. As well as collecting rabbits, go to Memories mode and play the games. For every level of a game you complete, you will get one star. They act similar to rabbits but obtained in a different way.

Here is a gameplay trailer safe for work: