You have to use the code key to crack the code for the letter hints.

But in order to activate the Chamber, he needs to acquire two code keys.

He set the timer on the computer so that it would destroy itself and all of its code keys in one hour.

She walked up the stairs and down the hall, and pushed the code key in 325, where her name was already displayed.

He still held the code key to every computer system he'd set up in Central and South America.

Fisher was adjusting the volume controls and searching for the code key.

When they finally removed him from the bunker, his hand was frozen over the last code key.

"This panel has a five-letter code key, and they didn't give it to me."

But I can't access it without a code key.

But I can't figure out this last code key.