Normal sudoku rules apply.
In each row and column, when a 9 is in the middle of a set of 3 adjacent digits the other 2 digits must sum to 9.
Killer cages: Digits inside a cage must sum to 9.
Sandwich sums: Digits outside the grid are equal to the sum of the digits appearing between 1 and 9 in the corresponding row or column.
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Solution code: Digits in row 4 (left to right) followed by the digits in column 5 (top to bottom)
on 17. October 2022, 16:34 by Leoninus
Great puzzle. I really enjoyed the implications of the "tummy" restriction.
on 17. October 2022, 01:02 by HariSeldon
Very nice puzzle. Had to restart multiple times, but I’m glad I stuck with it. Thanks!