Easy Sudoku X Online

Easy Sudoku X is the right place to learn the diagonal variant. With 34 or more givens on the board, most cells fall to the standard naked-single and hidden-single moves you already know from classic sudoku — the new habit is just scanning the two diagonals as a third unit type. The diagonals are picked out with a subtle background tint so you can see them at a glance. Each puzzle on Sudoku247Online is freshly generated and uniquely solvable by pure logic, so the diagonal rule never creates a guess; it just opens up more eliminations than you'd see on Classic Easy.