This page contains Metal Gear Solid Unlockables for Gameboy Color called "Sound menu" and has been posted or updated on Apr 18, 2007 by yavasloveserv. Let us know what you think of this Unlockable by thumbs voting.
Complete the VR training missions with a 100% ranking. The sound menu will be unlocked at the options screen and allows all game sounds and music to be played.
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