Stay in Your Box

Normal sudoku rules apply.

INVISIBLE LINES:

• Every box contains an invisible 'index line' whose route must be determined.
• The index lines are all 9 cells long, only move orthogonally (not diagonally), and don't cross any 3x3 box borders. They don't cross themselves, or pass through any black or green spots.

DIAMONDS:

• Each row, column and box contains exactly one hidden diamond, which lies at one end of its index line, and contains its box number. (Boxes are numbered 1-9 in normal reading order from top left to bottom right.)

INDEXING:

• The digit in position N along an index line (starting at the end with the diamond) indicates the position along the line where the digit N should be placed. Eg: if the 1st digit is a 3, then the 3rd digit will be a 1.

SPOTS:

• Digits separated by a black spot are in a 1:2 ratio.
• Digits separated by a green spot have a difference of at least 5.