There are only 3 digits in sudoku (1,2,3).
There must be exactly two identical digits in each column/row.
Each region (2*2) must contain all three digits at least once.
Digits along green lines sum up to 5.
Positive constraint: each 3 sees at least one 3 with knight move.
Solution code: Row 5 and column 5, no spaces.
on 27. December 2022, 20:55 by Rollo
Nice, but it is no 'irregular grid', no sudoku, no killer and there ist nothing new in it.
on 27. December 2022, 18:29 by Mitsunari
Nice one!
on 22. December 2022, 16:17 by nogirosta
i've fixed it :)
on 21. December 2022, 22:25 by dumediat
Very interesting concept! I nearly forgot about the positive knight move constraint on 3s near the end. Thank you for sharing!