When I was younger, I used to love playing Minesweeper, a single-player puzzle game, originally introduced in the 1960's, later adopted by Microsoft and pre-installed on every Windows-based computer. It's a great game to play whether you have a minute to play or an hour.
When Windows 7 was introduced, Minesweeper was no longer bundled with the Operating System. Not only that, but it's never been a part of OS X or iOS. For those of you who loved it as much as I did/do, have no fear... there's an app for that!
Minesweeper is available as a free download for OS X, iOS and Windows. Unlike many older games that were re-invented with new graphics, there are still versions that resemble the simplicity of the original game.