This is the million dollar question for all those great demo games that we find and want to do more! Of course, you have to purchase the full game via paypal or another credit card facility and then they will email you an unlock code and... hey presto you have the full game unlocked. I have found on a couple of demos and I don't know why this is but I downloaded the same demo/trial game twice after the 60mins expired and when it reinstalled the demo, it actually took me to the last place where I left off!! I was dumbfounded but got an extra hour at it to decide whether it was as good as I thought and then I purchased the full game and received my unlock code. Some of the games I have found are more expensive from some websites than others so best to join one for the long haul and either receive reduced priced games or gain points/tickets or even free downloads per month as a reward for being a continuing member.

msdiva31 is right on the money! If it's any consolation.... I had exactly the same dilemma and it took me a while to work it out let me tell ya!

Have fun !