Project Diva

Crypton Future Media, the company that created Hatsune Miku and some of the other VOCALOID series has teamed up with SEGA and launched a game called "Project Diva" using VOCALOID characters.

Project Diva is a game for PSP. Using the "free play mode", you are supposed to click on the right button at the right timing of the music when the icon appears (like DanceDanceRevolution). You can change the room settings, gain items by playing which enables you to decorate the dances more. "Edit Mode" enables you to grab your MP3 music and add the characters to dance to it with your favorite background and favorite character with favorite costumes, create PVs and games out of it.

There's a bunch of videos of the games uploaded and here you can see some of them.

【初音ミク】ProjectDIVAでRED ZONEを作ってみた【エディット】

【ProjectDIVA】 Canned Heat / Jamiroquai 【エディット・弱音ハク】

【project DIVA】巡音ルカ　ダブルラリアット【エディット】

【ProjectDIVA】初音ミク in Perfume チョコレイト・ディスコ

【初音ミク】初音ミク -Project DIVA- HARD　初音ミクの消失 指も【Project DIVA】

【初音ミク-ProjectDiva-】　とらドラ！OP　プレパレード

Look at the player's fingers toward the end of this video... amazing!

【初音ミク Project DIVA】プレイ動画と親指の動き【初音ミクの消失】

This one managed to trim out the character.

【七夕革命】Project DIVA　BB　ワールドイズマイン（ハート）　【再び】