Well, you didn't mention The Game (movie, 1997). It actually started the genre, and inspired a real-life game called Majestic which technically predates The Beast. It's very much worth watching for inspiration.

Majestic was lackluster but ambitious: it wanted to be a realization of The Game but lacked the necessary good writing and good acting to pull it off.

I've often wondered at what point technology and its side-effects will allow people who are dissatisifed to create or join alternate realities and literally tune in, turn on, and drop out. At what point can you say that you have effectively stopped living in 'reality'?