▲ 1 r/sudoku
Book recommendation
I just finished Fiendish Su Doku book by The Times and at the end I was able to solve majority of the puzzles in around 15 minutes. I heard that Nikoli Studios' X-treme sudoku can be a nice upgrade, is that true? And what advanced techniques do I need to know to solve them?
u/AcanthaceaeRich5009 — 4 days ago