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Usenet Newsgroups : rec.puzzles Hall of Fame

The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

Hall of Fame
Categories : decision : rotating.table.p

Four glasses are placed in the four corners of a square rotating table
(like a lazy susan).  You wish to turn them all in the same direction,
either all up or all down.  You may do so by grasping any two glasses,
feeling their orientation, and optionally turning either over.  There
are two catches:  you are blindfolded and the table is spun after each
time you touch the glasses.  Assuming that a bell rings when you have
all the glasses up or all the glasses down, how do you do it?

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