As purchase bonuses for the collection edition, it includes Metal Gear: Ghost Babel—the series first title for handheld consoles, released in 2000—and Metal Gear Solid: Digital Soundtrack Vol.2, featuring numerous iconic tracks that enhanced Snake's missions, ranging from BGM used in the games to vocal songs.

[Game List]
Metal Gear: Ghost Babel

[Soundtrack]
Metal Gear Solid: Digital Soundtrack Vol.2
*The soundtrack can be enjoyed using the dedicated sound player included within the game.

More details on the official game page of METAL GEAR SOLID: MASTER COLLECTION Vol.2 BONUS CONTENT ...