Standard Sudoku rules apply.
Some cells in the grid are to be highlighted. Clues around the outside of the grid show the sum of the digits in each distinct block of highlighted cells in that row or column (or show what the sum must be strictly less than). All clues appear in the correct order, and all possible clues are shown.
Here's the link to solve on Penpa+, and enjoy!
Solution code: Row 5, Column 8.
on 12. February 2023, 11:50 by jwmpuz
Fantastic puzzle concept. Very difficult puzzle, but logical solving path and very satisfying.
ALSO, replying to ICHTUES from over a year ago, the puzzle solution at your link has two "2"s in box 9.
on 26. October 2020, 21:55 by dm_litv
Nice. More like Japanische Sums.