9v9 Sudoku Game: Different Difficulty Modes

Across the 81-cell grid, preset digits shape the puzzle from the first move. In the 9v9 Sudoku Game: Different Difficulty Modes, five options set the amount of filled spaces, from easy and medium to challenging, very challenging, and crazy. A daily challenge adds a fresh board each day at no cost. Every match uses the same 9x9 layout. Difficulty changes with the number of given digits. More filled cells leave fewer blanks to solve. Fewer givens leave wider gaps across the board.

How to play?

Place digits into the empty cells using the numbers already printed on the grid. Fill rows without repeating 1 through 9. Do the same in each column. Each 3x3 box also needs the full set of digits once. A repeated number triggers an error. Fix that wrong entry before moving further, or later placements will follow a false line.