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I'm curious as to why you continue to play for play money. If your goal is simply to see a lot of hands with no risk and no investment except for your time, why not play the freerolls on sites like Absolute or Poker Champs. At least you have the chance of winning something, even if it isn't very much, and it seems likely that the overall level of play will be somewhat better than on the play money tables."
There is no difference in Play money and Freerools that I have seen yet. I also do it to work on calculating pot odds faster.