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This one came to my attention about 30 years ago. If my memory hasn't faltered (possible ;) ), it was in a Mensa test, possibly in some (maybe disreputable?) magazine.

On a sheet of paper, draw 9 dots in a 3x3 grid. Using a pencil connect (by crossing) all 9 dots with 4 straight lines, without lifting your pencil from the paper.

9_dot_b.bmp

Think "Outside the Box"

Most folks build in the rule that's not in the puzzle... They stay within the confines of the matrix.

9_dot_spoiler.bmp

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