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 Prisoner's Balls

 The prisoner moves all the balls save for one white ball into one urn. There is a fifty-fifty chance that the guard will select this urn and save his life, in the other urn there is a 49:99 chance of being saved. This moves his net chance of survival up to a hair under 75%.

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