You have three houses or squares
drawn on paper and below them three smaller squares representing
gas, water, and electric. Can you draw a line and get each
utility into every house (9) total lines, without crossing over
common solution or should I say No Solution.
Diagrams Are Below....
Without the drawing being 3D this puzzle
cannot be done. Many people say it can but using the drawing
above it cannot. The best result you may get is only eight
proper connections. Other variations of the puzzle can be found
below. People who are much brighter than I can explain
better so here is what some of them say about the puzzle.