Active Sporclers will notice more games popping up that have been created by some of the users in the Sporcle community. Right now, we have a very small group of folks signed up to help create games and test out our new tools for creating games and help us work out the kinks. This is a closed program for now, but in time, we hope to open this up with the goal of having full blown user generated games for all.
These games are submitted by users and then edited and approved by us here at Sporcle for release.
Anyway, we will try to post more to the blog in the future to give more visibility into this process