Strategic solitaire card game — almost every deal is solvable
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The thinking person's solitaire. FreeCell rewards planning and patience over luck, making it the right choice when you want a puzzle that's almost always winnable if you're careful enough.
Almost. Of the 32,000 standard numbered deals, only 8 are provably unsolvable (deals #11982, #146692, #186216, #455889, #495505, #512118, #517776, and #781948 are the most cited). If you're playing a numbered deal that isn't one of those, a solution exists even if you can't find it.
Technically one at a time, but most implementations let you move stacks as a shortcut. The number of cards you can effectively move in one action equals the number of empty free cells plus one (multiplied by two for each empty tableau column). Filling up your free cells shrinks this dramatically.
Paul Alfille created FreeCell in 1978 while a medical student at the University of Illinois. He programmed the first digital version for a PLATO computer terminal. Microsoft included FreeCell in Windows 3.1 in 1991, which is when it reached mass popularity.