FreeCell is a solitaire card game played using the standard 52-card deck. It is fundamentally different from most solitaire games in that very few deals are unsolvable, and all cards are dealt face-up from the beginning of the game. It was originally created as a computer game by Paul Alfille. Microsoft has included an implementation of FreeCell in every release of the Windows operating system since 1995, which has greatly contributed to the game's popularity.