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Nine dots (Posted on 2003-02-14) Difficulty: 3 of 5
Consider 9 dots arranged in a three by three square. Connect all these 9 points with four lines without lifting your pen from the paper.

See The Solution Submitted by Gautam    
Rating: 3.3529 (17 votes)

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re(4): more difficult | Comment 14 of 20 |
(In reply to re(3): more difficult by Bryan)

if you wrap the paper around a cylinder you can connect all the dots with one line EVEN IF they are points. the trick is to wrap it at some angle, rather than parallel to the edges of the cylinder.
  Posted by Phil on 2004-02-01 20:32:35

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