Related Clues:
- Hearts not in increasingly exclusive problem
- Puzzle in game resolved
- Real mystery
- Knotty problem knotting ropes!
- German coding machine deciphered at Bletchley Park in 1940
- Puzzling riddle
- Model's difficult question
- Me drunk with a gin? It's puzzling!
- Puzzle in game needs to be worked out
- Question model
- German cipher machine used in the Second World War
- Fill in puzzle
- Mystery in game, possibly, e.g. man I exchanged
- Ciphering system cracked by Alan Turing
- Hard-to-crack puzzle