Problem:

You are a spy who needs to crack a safe. The safe has a digital keypad with digits 0-9. You have intercepted a note intended for the safe's owner, which reads: "Dear friend, remember that the order reverses the position. Yours truly." You have only one chance to enter the correct 4-digit code. What sequence will you enter?

Scroll to the bottom of the page for the answer

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Solution:

The clue suggests that the code is a simple reversal of a logical sequence. A common sequence might be chronological order (e.g., 1234). Following the clue, the reversal of this sequence would be 4321. Hence, you should try entering 4321 to open the safe.