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Detective riddle

A spy transmitted a coded distress signal consisting of a sequence of blinking porch lights: long, short, long, short. When the counterintelligence team decoded it using Morse code, it spelled 'K-A-R-T'. The agent later confessed he made a deliberate mistake in transmission because he was being watched by enemy guards. If the correct word he intended to send was 'T-A-N-K', how many light blips did he intentionally alter?

About this riddle

Detective riddles are tiny mysteries. Look for the detail in the story that does not fit; it is usually the clue that solves the case.

Difficulty: Hard. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.

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