Fill the grid with numbers 1 to 7, so that each number occurs exactly once in each row, column and boldly outlined region.
The grid is toroidal, that means the upper border is glued with the lower border, the right border with the left border, so that you get a torus (a "donut"). Some regions wrap around the borders of the shown grid.
Solution code: Both main diagonals, first from upper left to lower right, then from upper right to lower left.
on 30. August 2021, 02:04 by Realshaggy
Added online-solving link, revised labels.
on 11. March 2015, 07:39 by Richard
for
on 9. March 2015, 14:06 by Joe Average
Ließ sich wirklich schön lösen... Eigentlich mag ich torodiale nicht, aber wegen pin7guins Kommentar in einem anderen Rätsel habe ich mich doch dran versucht. Jetzt habe ich auch alle Buchstaben zusammen. :-)
on 6. March 2015, 18:30 by Mody
Ließ sich schön flüssig lösen :)