FreeCellisasolitaire-basedcardgameplayedwitha52-cardstandarddeck.Itisfundamentallydifferentfrommostsolitairegamesinthatveryfewhandsareunsolvable.Althoughsoftwareimplementationsvary,mostversionslabelthehandswithanumber(derivedfromtherandomnumberseedusedtogeneratethehand).SUDInc.