Place the digits 1 to 9 in every row, column and 3x3 standard block and 4 extra regions painted with grey. All digits on two main diagonals must also be different. There exist no diagonally neighbouring cells with consecutive digits.
Solution code: Both diagonals, first the one from top left to the bottom right, then the one from top right to the bottom left.
on 15. August 2021, 23:40 by zhergan
Tags and labels revision..
on 6. February 2014, 20:08 by Oliver Strauß
I think I found the logic way of zhergan - no T&E needed.
on 7. November 2012, 09:24 by Hasenvogel
Einstieg nur mit T&E, dann läuft´s aber durch
on 14. October 2010, 19:24 by julius64
@Zhergan Thanks for this Sudoku :)