SUDOKU HARD - HARD SUDOKU THINGS TO KNOW BEFORE YOU BUY

Quads are much rarer, they usually’re considerably less useful in a means considering the fact that they don’t Allow you to slender down a large number of candidates suddenly, but when you notice 1, it’s well worth investigating. Fixing solitary squares may also convert quads into triples or pairs, so don’t ignore these!Hard level sudoku pu