Region 5152
Rules:
1. Normal sudoku rules apply.
2. Digits in cages must sum to the small clue in the top left corner.
3. Clues outside the grid give the sum of the indicated diagonal, and digits may repeat.
4. Digits along the blue line have an equal sum N within each 3x3 box it passes through.
Do have a go!
Link: CTC
Solution code: Row 8 and Row 9 (18 digits, no space)
on 27. March 2023, 01:43 by Mr.CHEN
A Chinese solve video(SPOILER ALERT):https://b23.tv/TrtKFVo