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UPDATED 03/03/2013 .
If you like formal logic, graph theory, sappy romance, bitter sarcasm, puns, or landscape art, check out my webcomic, xkcd . Blue Eyes: The Hardest Logic Puzzle in the World A group of people with assorted eye colors live on an island.
To expand your mind you need to learn new facts and develop new modes of thinking that will make the information that you already know more useful. Solving the following problems requires a combination of world knowledge, mathematics, common sense, logic, and science (chemistry, physics). This is not an IQ test.
Welcome to my selection of mathematical puzzles.
miscellaneous (toys, brain training, etc.)
F ive sailors survive a shipwreck and swim to a tiny island where there is nothing but a coconut tree and a monkey.
You are cordially invited to match wits with some of the best minds in IBM Research.