A FreeCell relative with eight free cells (four filled at the start) and suit building. One of the most solvable solitaires there is.
FreeCell was created by Paul Alfille in 1978, who programmed it on PLATO — the University of Illinois’ pioneering educational computer system, one of the first with graphical, color displays. Alfille started from an older game called Baker’s Game (which builds by suit) and switched the rule to alternating colors, which made nearly every deal winnable.
That change gave FreeCell its identity: with all cards in view and almost always a solution, it became the solitaire of pure reasoning — if you lose, you lose to a mistake, not to bad luck.
Worldwide fame came through Jim Horne, who wrote a Windows version; Microsoft went on to ship FreeCell with Windows (from the Entertainment Pack to Windows 95), putting it on millions of computers.