Extreme Mine-Sweeper A Javascript version of the Windows game. By Semperaliquid

SETTINGS

Extreme Minesweeper

Turn flags off
 

Choose your preferred level of risk
Picnic (15%)
Comfortable (21%)
Uncomfortable (25%)
 

 
Customise the grid
 
Horizontal:  Vertical:
 

CONTROLS
Standard

• Click on a tile to clear it. If it is mined, the game is over.
• Right-click or alt-click to set/unset a flag (!). Flagged tiles are protected against accidental detonation.
• Shift-click to set/unset a query (?). This can be helpful when you are trying to figure out a pattern and uses a symbol that won't be confused with your flags.
• Shift-alt-click clears all queries.
• Queried tiles are not protected.
• You win when you have cleared all the safe tiles and flagged all the mines.

Extreme

• The keyboard is ignored and any click (left or right) will clear/detonate a tile.
• As with the standard version, if the tile is mined, the game is over.
• You win when you have cleared all the safe tiles.
• Fat chance!

On Game Over click anywhere on the grid to start a new game

MISSION
Any tile may hide a mine. Your task is to identify and mark those that do, and clear those that do not. A cleared square will tell you how many of its immediate neighbours are mined; a blank means none, and, because that's a no-brainer, the programme helpfully saves your mouse-finger by clearing those neighbours too.
 
Obviously, the first tile will be a gamble (though the odds are in your favour) and later in the game you may face toss-of-a-coin situations, but most of the time you will be gauging probability, reading distribution patterns and exercising logic.
 
The Extreme variation works in exactly the same way; you just have to flag the mines mentally instead of on the screen. In either case, it's a great game.