The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.


The Three Lights

Luckily for you, one trip is all that is needed.

Turn two switches to the "ON" position. Wait a few minutes. Turn off one of the two switches. When you reach the three lamps on the top floor, one light will be on, one light will be off and cool, one light will be off, but still warm.

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