I have often spoken about Minesweeper as being one of the perfect games. More people play it and solitaire than any other game.
That's because it comes bundled with Windows. In recent years, Spider Solitaire and Free Cell have been added to the list, among others.
To counter me, folks have said "well, nobody BUYS minsweeper, it is popular because it is free."
But you can now Buy Minesweeper for the low low price of $19.99.