Connect the dots


Connect the nine dots on the left with 4 straight lines without taking your pencil off the paper and without going over the same line more than once.
Now, after solving the above problem, try to connect the 16 dots on the left with 6 straight lines. Again do this without taking your pencil off the paper and without going over the same line more than once.
Using straight lines draw a cross by connecting 12 dots so that 5 dots are inside the cross and 8 dots are outside the cross. The cross has to be symmetrical.

Problems from:
van Delft, Pieter and Botermans, Jack. 1997. Denkspiele der Welt. Heinrich Hugendubel Verlag, München
 
Return to Brain Teaser Index