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Down from the Blacked-Out Department Store (illustration)
FILE No.128Unsolved

Down from the Blacked-Out Department Store

Difficulty ★☆☆about 5 minEveryday MysteryFresh thinkingUses
A blackout stops the elevators and escalators. The stairs are closed for construction. How do you get from the 5th floor to the 1st?

Case Record

You are on the 5th floor of a department store when a power outage turns off the lights. The emergency lights are on and the building is calm.

The stairs are closed off for construction and cannot be used. The elevators and escalators have stopped completely because of the blackout. There is no barrier or obstacle blocking the escalators. A building announcement from the management says, "You may walk down the stopped escalators."

Your question

How did "I" get down to the first floor?

Case Files

Diagram

Ways down from the 5th floorWay downConditionStairsClosed for constructionElevatorStopped by the blackoutEscalatorStopped; no barrier or obstructionAnnouncement"You may walk down the stopped escalators"
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

What does an escalator become when it stops?

Open hint 2

Does the problem say the escalator cannot be used?

Open hint 3

Are "not moving" and "cannot be passed" the same thing?

Solve It

Your question

How did "I" get down to the first floor?

Choose the answer closest to the truth.

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The Truth

Walked down the stopped escalator like stairs

The answer is "Walked down the stopped escalator like stairs."

An escalator that is not moving is just a staircase. Nothing blocks passage.

Climbing out a window or prying open elevator doors is dangerous, and neither is mentioned in the problem. If you keep waiting, you have not "gone down."

A stopped escalator is just stairsWay downUsable?StairsNo (closed)ElevatorNo (stopped)Stopped escalatorYes: walk downClimbing out of a window or prying a lift door open is dangerous and notdescribed.
Diagram of the solution

Key Points

  • Check what "cannot be used" really means
  • Think about what a stopped thing is good for
  • Do not choose dangerous methods

Why people get fooled

Because you assume "the escalator has stopped, so it can't be used."

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