The Lamp Test

You are outside a room with 3 switches and 3 lamps inside. You cannot see inside. How do you match each switch to its lamp in one visit?

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Quick Answer & Explanation

Turn switch 1 on

The answer to this riddle is Turn switch 1 on. Difficulty: Medium · Solved by 13,815 puzzle lovers.

Turn switch 1 on for 10 minutes, then off. Turn switch 2 on. Enter. The warm-off lamp is switch 1, the on lamp is switch 2, the cold-off lamp is switch 3.

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