Rules
Normal Sudoku Rules apply.
Region-sum Thermos. Digits along lines are divided into region sums: The sum of all the digits that appear on a given line in a given box. Along lines, the box-sums must increase as they move from the dark blue end towards the white end of the line, that is, as they approach the crest of the wave.
Boat Lines: Brown lines are boats. On boats, all pairs of adjacent digits along the line differ by the same value and digits cannot repeat.
Solution code: Row 3 and Column 3 without spaces
on 9. June 2023, 21:36 by DanishDynamite
A gorgeous sudoku! And challenging.