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Mindbender: Waterlily

A water lily growing in a circular pond doubles in size every day. It takes thirty days…

Mindbender: Heaviest of 3

You have nine ball-bearings, all of the same size but one slightly heavier than the others, though…

Mindbender: A&E

A man and his son were admitted unconscious to a local Casualty (Accident and Emergency) department after…

Mindbender: Nine Dots

[Republishing some of the old mind benders that were posted on the old site.] Without lifting pen…

Three Card Brag

Required: Pack of playing cards Play 3 Cards are dealt to each player. A player who holds…