This is a list of April Fools joke hidden around the Pop'n Music franchise every 1st day of April.
Doki Doki Pop'n Music
Doki Doki Pop'n Music (どきどきぽっぷんみゅーじっく Doki Doki Poppun Myuujikku?), literally Heart-throbbing Pop'n Music, is a dating sim game and a spin-off of the Pop'n Music series. Otherwise it was released on April 1st (April Fool's Day), it was mentioned in Pop'n Music 20 fantasia as a "joke game", symbolizing this is the game's prank.