During a blackout, a safe’s interior light briefly flickered on, then off. Opening revealed nothing missing. What was the purpose of this flicker?
Category: Mystery · Difficulty: expert
Hint: Think about security systems that alert without alerting.
Answer
A hidden sensor detected unauthorized access
Explanation
The flicker served as a sensor trigger to notify owners of tampering without obvious alarms.
This is a expert mystery riddle — one of the harder riddles here. The answer is A hidden sensor detected unauthorized access.
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