Normal sudoku rules apply. Draw a single line connecting 29 different cells in the grid that starts and ends with the two given digits. The line can reach a cell in the border of the grid only at the start or at the end of its path. The line cannot intersect itself and cannot branch. No 2x2 in the grid can be entirely covered by the line or entirely not-reached. Adjacent digits on the line must be consecutive. In cages, the digits on the line sum to the cage total.