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.


Close Quarters

 Take two ordinary U.S. quarters and touch them together. Tough, huh?

Now take a third quarter and position it in a fashion so that it touches the other two. How many quarters can you add so that each quarter touches every other quarter?

For those of you outside the U.S., or in extreme poverty, a quarter is a circlular coin about 2.4 cm in diameter, and a thickness of about .15 cm.

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