Help finding the name of a movie?

my many years of pirating movies have been punished by frequent lack of memory when it comes to good movies i saw when i was young. the movie is about these people who created a virtual earth where people lived and what not, it was used for simulations. the main character is the main suspect for several murders and when he digs deep enough into the situation he realizes that they themselves are just a simulation program(them being the first simulated world to ever make a grid within a grid) he follows someones instructions to drive away from civilization past all signs and all road block and he would find the edge of the grid, when he does so he realizes that the creator of his world is a serial killer who has been taking over his body and killing the simulations so he could get the rush of murder without consequence...and then i draw a blank . i think its less than 20 years old, thanks for your help again sorry its vague.