A runner sprints towards an invisible line but cannot cross it, though no fence or wall exists. What prevents the passage?
Category: Story · Difficulty: medium
Hint: Modern security uses light beams that are hard to see.
Answer
A security laser grid
Explanation
Security lasers create invisible light barriers that stop movement if broken, preventing crossing.
This is a medium story riddle — a moderate challenge for most people. The answer is A security laser grid.
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