Rules:
Normal sudoku rules apply. Digits cannot repeat within a cage. Digit sums of the cages may have at most three distinct values.
Solution code: Row 2 followed by column 5 (18 digits, no spaces)
on 28. March 2022, 22:41 by JayForty
Very nice puzzle! Very hard but well crafted.
on 28. March 2022, 17:59 by twobear
Very very great puzzle!! Figuring out the three killer sums is already a 4 stars puzzle for me, and the solve after that is still a quite challenging one. Overall it’s 5 stars difficulty for me. Again, I think it’s a very nice puzzle (it remains very nice until the very last deduction!), and I hope this comment would encourage more solvers to give it a shot :)
on 28. March 2022, 06:58 by Yawnus
@adam001, I triple-checked that the puzzle is valid exactly like that. Perhaps you should try again to find the right cage sums!