Mathrax Sudoku
Solve online in F-Puzzles (thanks checkoway!) or in Penpa+ (thanks Nick Smirnov!)
Place the digits from 1 tot 9 in every row, column and 3x3-block. Some intersections of the grid lines are marked by a number and an operator (+, -, X, /) in a circle. The number is the result of the operation, applied to both pairs of diagonally opposite cells. An "E" in the circle indicates that all four adjacent digits are even; an "O" indicates that all four adjacent digits are odd.
Solution code: Row 8, followed by column 8.
on 23. November 2021, 20:33 by Richard
Added links for online solving. Thx checkoway and Nick!
on 22. July 2021, 08:52 by checkoway
https://f-puzzles.com/?id=yhejtfgk
on 23. November 2020, 16:37 by Nick Smirnov
Penpa:
https://git.io/JkiLe
on 3. June 2016, 04:22 by ohm0123
Mathdoku good. It's easy. Thank you, Richard.
on 2. September 2014, 11:31 by flaemmchen
Hat mir wieder sehr gut gefallen :-)) Vielen Dank!