Here is a simplified version of the connections between the nodes. Because of the open nature of this puzzle, there are many ways to go from the start to the finish, some longer than others. The solution highlighted above is s - 10 - 12 - 5 - 13 - 1 - f. All other solutions add addtional nodes before going to node 10. One example is s - 8 - 2 - 4 - 9 - 10 - ... and another is s - 11 - 6 - 3 - 9 - 10 - ... .