One of the traps you can fall into with improv is trying to create a final, once-and-for-all list of improv games. I had one friend who compiled hundreds of games into a fat binder, and was constantly reworking and updating his ultimate improv opus. He died before it was ever close to being finished.
Looking over my files, I see that my oldest Complete Improv Games List goes back to 1991, and in the years since, I’ve made many “final lists” and “even-more-final lists”.
In practice, it’s impossible to create a definitive list. People are creating new improv games all the time, often Rubik’s Cube reshuffles of previous games that you probably wouldn’t want to inflict on an audience. But sometimes you’ll come across a game that uses a really clever principle. So, I haven’t tried to be comprehensive with the games lists on this site. I’ve mostly stuck to games that I like, that work in a show, and that offer something useful.
And eventually, it will all be in a published book.
Or else it won’t.