It's great until it starts cheating. I beat Klondike on Grandmaster 4 times in a row, immediately after the 4th time of winning, the algorithm changed to where no matter how many times you play, each game ends up with No Moves Left. I have proven my theory by playing 1500 more rounds and not a damn thing has changed yet. Way to kill a classic Microsoft. I grew up playing this game with my grandfather on the P.C. back in the early 90's, now it's not even playable let alone enjoyable. Thanks a lot