The aim is to draw a single contiguous line from the upper left corner to the lower right corner. The line includes each number from 1 to 39 exactly once.
CSV:
1,25,23,12,31, 3,20, 2,15,13,19,23 36,22,28,27,32, 4,19,21,20,11,29,12 34,13, 7,23,19, 8, 2,11,36, 8, 2, 3 7,24,38,29,23,19,27,17,37,14,11, 7 2,23,21,30, 6,20,38, 6,28, 9,33, 8 28,13, 9,11,36,18,16,15,11,18,34,14 1,36,11, 2, 9,14,19,35,38,25,20, 7 20,21,33, 8,15,23,20,29,30, 5,32,18 10,34, 7,26,13,34,21,35, 9,13,16,17 15,37,23,22,24,18,24,37,29,24,26,10 31, 3,34, 8,27, 7,37,15,20,21,23,35 7,29,17,14,26,23,24,18,36,20,19,39