The Return Journey

At last they came up the long road, and reached the very pass where the goblins had captured them before. But they came to that high point at morning, and looking backward they saw a white sun shining over the outstretched lands. There behind lay Mirkwood, blue in the distance, and darkly green at the nearer edge even in the spring. There far away was the Lonely Mountain on the edge of eyesight. On its highest peak snow yet unmelted was gleaming pale.

Normal sudoku rules apply.

Begin by filling in the "boulder" digits from the previous puzzle into their corresponding locations (pale blue cages).

Digits along Bilbo and Gandalf's path (brown lines) must be between the digits in their journey stopping points (circled ends).

Box borders divide the Great River (blue line) into segments that sum to the same value.

In cages, digits do not repeat, and sum to the given value.