Rules
Normal sudoku rules apply. Digits on a purple line must form a consecutive sequence (no need to be in the order) of non-repeating digits. Digits on the arrow must sum to the digit in the circle attaching to.
Global constraint: Every I-shaped triomino (3 consecutive cells in any row or column), must contain a digit each from the groups: 147, 258, and 369).
Links
Solution code: The increasing sequence of renban in col 1
on 17. November 2022, 21:16 by Snookerfan
Very minimalistic, nice!