My dad's been playing Free-Cell since way back in the early days of Windows 95. He's also been big on Spider Solitare since that came out with Windows ME.

I'd bet that in the past 12 years, he's played about 50% of the 32,000 Free-Cell games.

At least one game a day (average), it would take you almost 88 years to complete every came.

According to Wikipedia, these are very difficult games:

169, 178, 258, 454, 617, 718, 1689, 1941, 2021, 2350, 2577, 2607, 2670, 2772, 3285, 3342, 3349, 3685, 3772, 3788, 3801, 3973, 4257, 4368, 4540, 4591, 4714, 4946, 5179, 5374, 5453, 5482, 5490, 5548, 5557, 6343, 6673, 6745, 6751, 6768, 7107, 7160, 7600, 7700, 8005, 8323, 8534, 8591, 8652, 8678, 8749, 8820, 9250, 9385, 9538, 9617, 9700, 10589, 11281, 11386, 11409, 11430, 11677, 11854, 12211, 12313, 13015, 14051, 14188, 14676, 14795, 14879, 14965, 14977, 15023, 15099, 15130, 15133, 15164, 15227, 15238, 15710, 15746, 15905, 15939, 16191, 16575, 16576, 17277, 17524, 17764, 17768, 18623, 18992, 19410, 19484, 19633, 19763, 19861, 20055, 20251, 20589, 20715, 20912, 21051, 21185, 21278, 21785, 21896, 21899, 22332, 24063, 24457, 24549, 24735, 25123, 25155, 25450, 25599, 25602, 25790, 25856, 25995, 26093, 26183, 26197, 26369, 26421, 26576, 26693, 26694, 26710, 27188, 29001, 29154, 29198, 29345, 29704, 30000, 30108, 30394, 30615, 30712, 30801, 31044, 31266, 31465, 31601, 31647, 31729, 31918, 31945.

And 11982 is supposed to be the hardest of all.

Get goin' Daniel.

After that, you can try the 8 unbeatable ones in the most recent FreeCell version (not sure if that's the XP or Vista one): No. 11,982, No. 146,692, No. 186,216, No. 455,889, No. 495,505, No. 512,118, No. 517,776, and No. 781,948.