Primary BOX 4 (Japanese: プライマリーボックス4) is a fan video game album by "Macaroni Ketchup" (Japanese: まかろに☆けちゃっぷ), released on August 12, 2013, containing remixes for tunes from Game Boy Advance games. The cover has artwork of Starfy, Moe, Herman, a Mr Saturn and a Game Boy Advance on it. It has been listed for sale on Rakuten for 735 yen[1], despite the questionable legality of selling it.
The Densetsu no Starfy tune is a remixed version of the series Title Song, otherwise known as "Tone of Ocean".
Macaroni Ketchup has released previous albums in the "Primary BOX" series, as well as other video game albums, such as "ARLE IN WONDERLAND3" and "Rifurawa 2" (Japanese: りふらわ2).