52 empty cells
Hard
45 empty cells
Medium
35 empty cells
Easy
45 empty cells
Odd-Even
48 empty cells
Diagonal
50 empty cells
Killer
58 empty cells
Expert
52 empty cells
Hard
45 empty cells
Medium
35 empty cells
Easy
48 empty cells
Diagonal
45 empty cells
Odd-Even
45 empty cells
Medium
50 empty cells
Killer
48 empty cells
Diagonal