Yandex Sudoku

Across a 9x9 grid, blank cells wait for the missing digits, and every row, column, and 3x3 box follows the same rule set. A round in Yandex Sudoku uses all 81 spaces, with four difficulty options named easy, standard, hard, and expert. The page includes sound and music switches. Full-screen mode is available too. Error display settings can be adjusted, and number marks or hidden digits can be toggled from the options.

How to play?

Place numbers from 1 to 9 into the empty cells. Check the row first, then the column, then the 3x3 box before adding a digit. Pencil marks help track possible values in tighter spots. Remove a wrong number with the erase tool, or reverse the last action with undo. Hint moves fill in a position when the grid stalls. Finish boards on easy, then move into standard, hard, and expert to post a record for each setting.