At RubyConf this year, we hosted a Kids Track. One of the activities was to make web adventure games.
If you want to make a Pie game, go to the pie-bakery. If you have questions about creating games with pie or suggestions for improvements, you can sign up to this google group and post questions or ideas via the web or email.
Check out the games that the kids made this week:
I also gave a talk at the conference about the making of Pie. Here are the slides from the talk:
We just created a pie-cooks google group for people who are working on creating/improving Pie.
Pivotal Tracker project: