The highway road map looks like this:
+---+---+---+---+---+---+---+---+
| 7 | 3 - 3 - 3 - 3 | 5 | 4 - 4 |
+ | +---+---+---+---+ | + | +---+
| 7 - 7 - 7 - 7 - 7 | 5 | 4 | 9 |
+ | +---+---+---+---+ | + | + | +
| 7 | 4 | X | 5 - 5 - 5 | 4 | 9 |
+ | + | +---+---+---+ | + | + | +
| 7 | 4 | 4 - 4 - 4 | 5 | 4 | 9 |
+---+ | +---+ | +---+---+---+ | +
| 4 - 4 - 4 | 4 | 9 - 9 - 9 - 9 |
+---+---+---+ | +---+---+---+ | +
| 2 - 2 - 2 | 4 | 5 | X | 6 | 9 |
+---+---+---+---+ | +---+ | + | +
| 2 | 5 - 5 - 5 - 5 - 5 | 6 | 9 |
+ | +---+---+---+---+---+ | + | +
| 2 - 2 | 6 - 6 - 6 - 6 - 6 | 9 |
+---+---+---+---+---+---+---+---+
This puzzle was printed in the Carnegie Mellon alumni magazine, in an article about Zack Butler, who had placed second in the 8th World Puzzle Championship in Budapest in October 1999. The problems during this contest are available at the World Puzzle Championship home page.
Back to The Highway Puzzle.