Expert Sudoku X
Expert Sudoku X — around 24 givens. Tighter than Expert Classic by a notch, because the diagonals give you a constraint surface Classic doesn't have. Plan a 20–35 minute solve.
Expert puzzles lean on X-wings, coloring, and combined chain logic. Not a starting tier — but a natural step if you've been finishing Hard in ten minutes or less.
Free downloadable Sudoku puzzles across four variants — Classic, Killer, Sudoku X, and Hyper — with answer keys on the back pages. No accounts, no colour ink.