18.09.2019, 11:05
regarding the consecutive circles sudoku. I believe that the rule is "digits on EACH grey circle are all different",in fact there are two circles with the same digits 6789.
I also notice that all possible sets of digits are used (1234,2345,3456 etc.) with one set used twice. Is there any requirement in this respect or is it just a coincidence?
Also. are all the possible circles marked?
I also notice that all possible sets of digits are used (1234,2345,3456 etc.) with one set used twice. Is there any requirement in this respect or is it just a coincidence?
Also. are all the possible circles marked?