A single leaked hint exposed the CIA’s most puzzling code. But dozens of the world’s toughest ciphers are still waiting to be solved.

It was the spring of 1942. America’s back was against the wall. The Japanese Navy ruled the Pacific. Pearl Harbor was still in ruins. In a dim basement beneath Pearl, Commander Joseph Rochefort ...

NOTE: The Nuclear Silo code pieces will expire after One Week. If you fail to collect all 8 code pieces before a week, you will have to re-collect any codes that have expired. When you collect all the ...