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Oh and uh... One more thing, Kid. If the darn thing proves to be too tough to crack for whatever reason, or you're just not feelin up to all the locks... [SHAKE] the thing around a little and the locks should all come loose. A little "Failsafe" they added in, heh. 

YESSS so the sound isnt just sound when you find the crack it does a different one! How neat

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Puzzle

Grants access to the Tunnels. Resonates strangely in your hands.

Blue Key

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Portal

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Minesweeper

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Nephster’s Number Crunchers

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Breaking into vaults? Not for everyone. Luckily I've got just the ticket here for ya, Kid. A brand-spanking new Practice Vault 2000. Think you're...

Breaking into vaults? - by @Ditchen on Castle