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.
Both for cells of the gamefield and for the font of timer and counter digits. 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. Both surrounding and internal walls can be opened as an option to make the game easier.
Adding internal walls without opening them will however make the game more difficult as the information on adjacent bombs is hidden for those cells. Bomb explotions are never harmful! When opening a cell that contains a bomb only a shield is lost.
So if you make a silly mistake you can still continue the game even though you won't be braking any records. When the player is out of shields he can not continue play. The player can choose any fixed number of shields or select them as a percentage of bombs on the gamefield. | 
