MineMaster is a freeware clone of MS Minesweeper with some nice extra features. Big playground. Size is limited only by your desktop size. Skins are supported. Playground can include walls that never contain a mine and can not be opened by clicking. Walls that surround the playfield can optionally be displayed. Bombs never explode! Opening a cell that contains a bomb looses a shield. Game is over when all shields are used.