Normal sudoku rules apply.
Every 7 in the grid must be a chess king's move away from an 8 which is a king's move from a 9, thus forming the sequence 789. Different 7s may share the same 8 and/or 9. (ie the rule applies to every 7 but not necessarily every 8 or 9).
Because 7 ate 9 the following rules also apply:
7 has grown by 9, so 7 = 16.
9 has been eaten, so 9 = 0.
6 is afraid of 7, so does not appear in any of the eight cells surrounding a 7.
Digits within cages sum to the number in the top left corner (remembering that 7 ate 9).
Solution code: row 2
on 22. March 2022, 18:39 by Chelo
Very funny, I like these constraints very much!.. Thank you!..
on 21. March 2022, 17:13 by Ceedrich
Very nice and funny rule set!