You can get Peggle free for a week. Okay, it's not the same as getting it for fee; but for a full ten days unlimited play, it's well worth considering if you haven't already bought the game. It's one of my favorite arcade games. If you really like Peggle you'll probably like another pe and ball game called Moleculous. You can get the week trial of Peggle (plus a word game) from the following link:
link removed
I'm not sure whether the above link will work because it's taken from an Email newsletter. You can find Peggle at Wild games where the offer has been made by following the link below, but it may be that the offer is only for those who receive the news letter?
You can find a demo of Moleculous at:
http://www.download.com/Moleculous/3000-2111_4-10414246.html
edit;
Unfortunately the link I posted was specific to my Hotmail account, so I've deleted it. You may be able to find the offer at Wild games, but I suspect it's been offered to newsletter receivers, so perhaps if you sign up for the newsletter soon, you'll get the Peggle offer. Personally, having bought Peggle, I think a weeks trial is superb. It'll give you the oppertunity to at least complete the adventure stages. There's four different modes Adventure, Quick Play (you can only play levels that have been unlocked in the adventure mode), Duel (available once you've completed one stage from the adventure mode. In this mode you play against the computer or a friend) and Challenge (This is only available once the Adventure mode has been completed and presents a further 75 challenges fr advanced players).
Images:
Peggle:
http://images.google.co.uk/images?hl=en&q=peggle&btnG=Search+Images&gbv=2
Moleculous:
http://images.google.co.uk/images?gbv=2&hl=en&q=moleculous&btnG=Search+Images