SuiriDaily mystery & logic club

The Night Mail Safe

The mail contracts for the night train are locked in the guard's safe. The guard set a new code last week, then fell ill and was taken off the train. His notebook survives: every test try he dialled, and the answers the safe gave. The contracts must be handed over at the next station. No symbol repeats in the code. Work out the four-symbol code.

Kind
Safe Code case
Difficulty
D 661
Tier
Sleuth · D 400–699
Worth
66 pts for a clean solve
Par time
3:45
Technique
Depth 3
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