Every programmer knows that numbering should start at zero!
Rules: Put the digits 0 to 8 once each in each row column and box.
Cages: Digits may not repeat in a cage and sum to the cage total. The cage totals form a consecutive sequence. If two cages have consecutive totals then they are orthoganally adjacent.
Link:
CtC App: https://tinyurl.com/2adsffyb
Solution code: Row 8 Column 5