

of MGS has to be put into the console when prompted, Special Missions doesn't work on Sony consoles where the disc slides in (i.e. PlayStation 2 or 3) but does work on the original PlayStation, PSone or PS2 Slimline where the lid pops up.
There are extra bonuses too, and a particularly popular one has been that you can play as the Ninja (which is suggested on the box cover). You can use his stealth camo, his ability to jump from place to place, his katana sword and his electric shield. Other interesting missions include solving Genome Soldier murder mysteries, which include working out who broke a surveillance camera, following footprints, searching a room for clues and even wearing a wig!
Genome Soldiers the size of Metal Gear before they stamp on Meryl, or shooting down a UFO before you are beamed up by it!I always thought Special Missions was underrated. Check out the opening intro to get a feel for the huge variety of missions you can try your hand at:

You can't expect too much merchadise with a simple add-on disc but Prima did release an Official Strategy Guide in America.
There is no soundtrack for Special Missions, but here are a couple of MP3s of some music specifically from this add-on game:
MGS / Characters / VR Training / Weapons & Items Strategies / Secrets / Codenames / Soundtrack / Twin Snakes