The Thirteenth Floor (1999)
I really enjoyed this movie; it's great. Of course, I figured out almost all the twists pretty easily as the movie progressed, but that's not its fault. It's more a reflection of the fact that I've seen a lot of other movies, including newer ones, that explore the same theme, which allowed me to feel like I was standing on the shoulders of giants. But overall, the movie has a wonderful plot, and I watched it with pleasure. It just started off a bit slow, and I was worried that I would be bored, but that wasn't the case.
Where do we end up when we save the world?