Some ciphers have simple keys, others, complex ones. The key for a cipher used by Augustus Caesar, some 2,000 years ago, was simple enough: The receiver just had to shift the alphabet one position.

An easy-to-spot characteristic of plaintext n is that it is preceded 80% of the time by vowels. The contact chart shows that ciphertext T is preceded 17 times out of 23 by ciphertext N, O, U, or A ...

Bethesda's latest game, Indiana Jones and the Great Circle, has you play as the world-famous archeologist and explorer Indiana Jones in his adventures, which take him all over the world.

Behind that wall is a wide-ranging puzzle involving the Castle Cipher. This takes quite a bit of work to solve on your own, but we've put together a full breakdown below.