Minesweeper Grid Options
Mines:10 to 400
Rows:8 to 40
Columns:8 to 40
Number of mines must be 25% or less
than the number of squares on the grid.
About Minesweeper

If you can not right-click then use Ctrl-Left-click to simulate a right-click. The grey flag at the top, next to the flag counter, will turn red to indicate when a left-click will behave as a right-click. You can also left-click the flag at the top to switch it between grey and red.