One of his more underrated movies, it's a fun thriller. Funny enough, Fincher himself doesn't like it much and said his wife tried to talk him out of making it:
"She was extremely vociferous, for instance, when she said, "Don't make The Game" and in hindsight, my wife was right. We didn't figure out the third act, and it was my fault, because I thought if you could just keep your foot on the throttle it would be liberating and funny."
Think he's being a little hard on himself but