Complete the indicated number of mini-games (all five rounds) in the gallery to unlock the corresponding song.

Song	How to unlock
Green Hill and Overworld	One mini-game
Sonic 2 Special Stage and Underwater	Three mini-games
Star Light and Underground	Two mini-games
Super Mario World Ground BGM and Let The Speed Mend It	Five mini-games
Super Mario 3 Ground BGM and Sonic Heroes	Four mini-games