Exhibit 51. MINESWEEPER 1990. Minesweeper was a standard feature of Windows from 1992 to 2012. More than just a game, in the early days of the graphical user interface, it taught people how to use a mouse. While Solitaire demonstrated the art of dragging and dropping, Minesweeper demonstrated the two-button mouse, left-click to clear a mine, right-click to place a flag. Pre-installed on more than a billion PC’s, Minesweeper is one of the most played computer games of all time.