FACTS ABOUT SUDOKU HARD - HARD SUDOKU REVEALED

Quads are much rarer, plus they’re a lot less practical in a way given that they don’t Allow you to slim down a lot of candidates all of sudden, but when you see 1, it’s worth investigating. Solving single squares can also flip quads into triples or pairs, so don’t ignore these!There's two solutions to Engage in a Sudoku puzzle, it is possi