Freecell is only a moderate challenge but you can almost always win there.
Having been interested in this in the past, I did a bit of research. Comments here indicate that there is only 1 game in the 32K on Windows that is unsolveable though you can get 2 more using an easter egg. Unfortunately, this proof doesn't list the total number of impossible games.
As for using puzzles to get to sleep - I am very envious.
Cheers - L~R
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Re^3: I've played solitaire with physical cards within the last: (mindless and hopeless)
by bmann (Priest) on Jul 12, 2005 at 16:48 UTC
Re^3: I've played solitaire with physical cards within the last:
by tlm (Prior) on Jul 17, 2005 at 02:27 UTC