This page contains Cave Story 3D Unlockables for 3DS called "Missile Upgrade" and has been posted or updated on Mar 18, 2013 by applebreeze. Let us know what you think of this Unlockable by thumbs voting.
Defeat Balrog in the Boulder Chamber and a treasure chest with the weapon will appear. Note: If you already have the Missile Launcher, it will be upgraded to fire new missiles.
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