Nordic Slopes by Katie Splendor: Colour mania

Today's Video:

Another excellent puzzle from Mrs. Splendor. Let me know how you got on, I seemed to have struggled with the entropy quite a bit!

Link to Play:

Nordic Slopes by Katie Splendor https://sudokupad.app/8hf319zz5v

Rules:

- Normal sudoku rules apply. - Global Entropy - every 2 by 2 box of cells has at least one low digit (1,2,3), one medium digit (4,5,6), and one high digit (7,8,9). - Indexing - on a blue index line, the digit in the Nth cell along the line (starting from the diamond) indicates the position along the line where the digit N appears. Eg: 3214 would be a valid line; the 1st digit, 3, indicates that the 3rd digit is a 1, and so on. - Ratio Kropki - digits separated by a black Kropki dot have a ratio of 2:1. No negative constraint. - X pairs - digits separated by X sum to 10. No negative constraint.