The Ending of the Movie

Rating: Null/10 (1 September 2006)

I am not a big game player.
I don't know the premise of the games.
Please someone, I just watched the movie and was confused by the ending.
Could someone, anyone, please explain what the ending meant? At the end of the movie was the father in a different dimension? Did the evil Sharon kill the good Sharon and her mom? This movie did a real mind screw with me.
PS.....I didn't get that Bruce Willis was dead either. LOL.
Thanks!