Optimization style for incr/decr buttons:
Board Size: Beginner / Intermediate / Expert / Custom

Click on a board size link to change the size. To place mines, click on the board, or click the smiley to remove them all. Use the +/- buttons to search for similar boards that increase or decrease one of the associated values. Below the board you will see the hexadecimal code for an .mbf (minesweeper board) file. If you click the load button and paste in that code, it will load the associated board.