Links for online solving:
Rules:
Normal Sudoku rules apply.
Normal Lockout Line rules apply: Digits in directly connected Diamonds must differ by 4 or more and may not be repeated on the line. Digits on a line must fall 'outside' the range defined by their diamonds. Line digits may repeat if allowed by other rules. All lines go straight.
Solution code: Row 5 (from left) and row 9 (from left - 18 digits in total):
on 26. September 2021, 13:04 by Niverio
A very clever use of the constraint! The break-in logic is very elegant and satisfying to work through, and the additional lines provided make sure the puzzle goes pretty smoothly!