This is a Flash version of Windows Minesweeper. Here you have larger fields: 19x19 and 25x25. Eventhough the fields are larger, they are quite easy to finish. To mark a mine, you can click the right mouse button, as in the Windows version, but it's quite annoying, because Flash player displays the right click menu each time you do it. To mark a mine, you can press space holding the mouse cursor over the squere you want to mark.