9. Connect Dots With Four Lines
There are nine dots arranged in a 3×3 grid. Connect all nine dots using exactly four straight lines without lifting your pencil.
Added 5 June 2008
Hint: Think outside the box and consider extending lines beyond the dots.
Solution:
The trick is to think outside the box — literally. The four lines must extend beyond the boundary of the 3×3 grid. Starting outside the grid on one side allows each line to pass through three dots, then continue past the edge to set up the next line. Most people assume the lines must stay within the square formed by the dots, but the puzzle never says that.
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