extra regions sudoku

For fans of Killer Sudoku, Samurai Sudoku and other variants

extra regions sudoku

Postby urhegyi » Tue Aug 10, 2021 8:51 am

The 4 coloured extra regions have also to contain the digits 1 to 9 only one time.
This can be solved by max an x-wing, so not that hard, but nice to try by hand.
Image
Code: Select all
.9.....6.7.......1....8......2...7..3.......6..7...1......4....1.......7.2.....4.
urhegyi
 
Posts: 495
Joined: 13 April 2020

Re: extra regions sudoku

Postby urhegyi » Wed Aug 11, 2021 6:02 pm

I found out that changing one given gives another puzzle that solved the same way!
Image
Code: Select all
.9.....6.7.......1....5......2...7..3.......6..7...1......4....1.......7.2.....4.
urhegyi
 
Posts: 495
Joined: 13 April 2020

Re: extra regions sudoku

Postby Hajime » Thu Aug 12, 2021 4:20 pm

You also can change the lonely 3 or 9 in 5 or 8. Keep them lonely. Nice puzzles !
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Re: extra regions sudoku

Postby urhegyi » Thu Aug 12, 2021 6:28 pm

Hajime wrote:You also can change the lonely 3 or 9 in 5 or 8. Keep them lonely. Nice puzzles !

Nice found.
Now we already have 6 different puzzles that solve the same way.
3 with 8's
Code: Select all
.9.....6.7.......1....8......2...7..3.......6..7...1......4....1.......7.2.....4.
.5.....6.7.......1....8......2...7..3.......6..7...1......4....1.......7.2.....4.
.9.....6.7.......1....8......2...7..5.......6..7...1......4....1.......7.2.....4.

and 3 with 5's
Code: Select all
.9.....6.7.......1....5......2...7..3.......6..7...1......4....1.......7.2.....4.
.8.....6.7.......1....5......2...7..3.......6..7...1......4....1.......7.2.....4.
.9.....6.7.......1....5......2...7..8.......6..7...1......4....1.......7.2.....4.
urhegyi
 
Posts: 495
Joined: 13 April 2020


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