Five-room puzzle

The five-room puzzle is a classical,^[1] popular puzzle involving a large rectangle divided into five "rooms". The objective of the puzzle is to cross each "wall" of the diagram with a continuous line only once.^[2]

^ Gardner 1959, p. 112 Gardner titles the problem (puzzle) as "Cross the Network" and refers to it as one of the oldest of topological puzzles.
^ According to Norris 1985, p.207 "One often encounters Eulerian graphs as puzzles. Consider the famous floor plan that consists of five rooms interconnected with themselves and the outside by doors on every wall. The puzzle is to start in one room or the outside, walk through every doorway exactly once, and return to the starting point."

[1] Gardner 1959, p. 112 Gardner titles the problem (puzzle) as "Cross the Network" and refers to it as one of the oldest of topological puzzles.

[2] According to Norris 1985, p.207 "One often encounters Eulerian graphs as puzzles. Consider the famous floor plan that consists of five rooms interconnected with themselves and the outside by doors on every wall. The puzzle is to start in one room or the outside, walk through every doorway exactly once, and return to the starting point."

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