Puzzles

The Cucumber Problem - A farmer has 100 pounds of cucumbers that are so fresh that they are 99% water.  A day later, enough water evaporates that the cucumbers are now 98% water.  How much do the cucumbers weigh now?  The answer is surprising!

Crossnumber Puzzle - Exercise your skills in basic arithmetic and number theory with this challenging numerical "cross-word" puzzle whose definitions depend on each other in a highly circular way.

Drs. Product and Sum - Listen in on a dialogue between a pair of logicians and then determine what they know.

Pirates - Five logical pirates divide their loot in a surprising way.

Retrograde Chess Puzzle - Given a chess position, determine the previous 6 moves.  This one is difficult and requires a thorough knowledge of chess rules.

Tricle Puzzle - You'll have to determine the rules yourself in order to solve the "Tri-Circle" puzzle implemented as a Windows executable.  Play with it until you discover its inner logic.  Look for patterns and don't be afraid to follow your intuition.  The program will tell you when you have won.  If you give up, here are hints, the mathematical background, and a solution to the puzzle.

Where did the other dollar go? - Three travelers split a supposedly $30 hotel room.  The owner later realizes that he overcharged by $5, which he gives to the bellboy to return to the guests. Not knowing how to split $5 three ways, the bellboy pockets $2 and returns $3 instead.  Thus each guest paid $9 for rooms and the bellboy got $2, for a total of $29.  Where did the other dollar go? 

"The art of simplicity is a puzzle of complexity" -- Doug Horton

"A good puzzle, it's a fair thing. Nobody is lying. It's very clear, and the problem depends just on you. " -- Erno Rubik

"There are 10 types of people in the world, those who can think in binary and those who can't."