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C,F,U?

published by Fred76 on Wed, 04/29/2015 - 10:21
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Player's feedback

Very nice round of sudoku GP. Thanks to the Serbian authors !

I wondered what was the meaning of letters C, F and U?
I guessed the C was for the Classic (very good work to have themed C1-C5 in order of difficulty). Is it correct?
What about F and U?

Fred

Submitted by rimodech on Wed, 04/29/2015 - 23:01.

thank you, fred!
it's correct: C = Classic.
and about f and u... we tried to separate the Familiar variations from the Unfamiliar ones.