Sachsentext
Change some digits in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 and so that no pair of changed digits is horizontal or vertical adjazent (diagonally adjazent changed cells are allowed).
Comments
no solution to Sudoku Correction #2 ?
This puzzle appears to have no solution (the second Sudoku Correction, starting with 218 in the first nonet).
r1c2 must be 1 (since r2c2 = 1 leads to a contradiction, no 3 possible in second nonet, soon enough). Then r1c5 can be neither correct (6) nor incorrect (not 6). Both branches lead to a contradiction, though neither is very soon.
I LOVE the sudoku correction idea and the other two correction puzzles. More, please :)
I'm also very impressed by the novelty of variant ideas and caliber of puzzles on this site.
No idea what I made this long
No idea what I made this long time ago. The wrong puzzle is now substituted by a new one.
Uwe