ENIGMA

Thu, 22 Aug '24

Tough nut to crack

Tue, 23 Jul '24

Cipher machine of W.W. II

Mon, 12 Feb '24

Riddle

Wed, 7 Sep '22

Very secretive sort

Sun, 24 Oct '21

Personality that's hard to read

Sun, 15 Aug '21

Monthly publication of the National Puzzlers' League, with "The"