The rhythm game “D4DJ Groovy Mix” for smartphones has been collaborated with the viewer participation music project “MILGRAM” and the original song “Undercover” has been added. “D4DJ Groovy Mix” “D4DJ Groovy Mix” is a rhythm game for smartphones that develops more than 200 songs for a wide range of people, from original songs to remix cover songs and BGM, with the slogan “connect”. This time, we collaborated with viewer participation type music project “MILGRAM”. The original song “Undercover” has been added. (C) bushiroad All Rights Reserved. (C) Donuts Co. Ltd. All rights reserved.