The goal of the game is to uncover all the squares that do not contain mines without being "blown up" by clicking on a square with a mine underneath. Clicking on the game board will reveal what is hidden underneath the chosen square or squares. Some squares are blank but some contain numbers (1 to 8), each number being the number of mines adjacent to the uncovered square. To help avoid hitting a mine, the location of a suspected mine can be marked by flagging it with the right mouse button.
Microsoft Minesweeper (formerly Minesweeper) is a minesweeper computer game created by Curt Johnson, originally for OS/2, and ported to Microsoft Windows by Robert Donner, both Microsoft employees at the time. First officially released as part of the Microsoft Entertainment Pack 1 in 1990, it was included in the standard install of Windows 3.1 in 1992, replacing Reversi from Windows 3.0. Microsoft Minesweeper has been included without a major change in all subsequent Windows releases until Windows Vista, at which time an updated version by Oberon Media replaced it.