Normal antiknight rules apply. Identical digits cannot be a knights move (in chess) apart from each other.
Normal little killer rules apply. Clues outside the grid show the sum of the digits along the indicated diagonal. Digits may repeat along the diagonal (if allowed by other rules)
Normal arrow rules apply, digits on an arrow sum to the circled digit.
The grey line is a palindrome whose digits read the same forwards and backwards
Solution code: Row 3 + Column 5 (ex: 123456789765432198)
on 19. June 2021, 17:59 by nunc
Very nice logic throughout the whole puzzle. Loved it!
on 19. June 2021, 17:15 by DiMono
Excellent puzzle. I really enjoyed how the midgame worked, very nice use of the geometry.
on 19. June 2021, 06:29 by cdwg2000
Very nice!