For your viewing enjoyment.
The video game is called "Left 4 Dead". It's a survival horror video game that is available for PC and Xbox 360. A talented gamer created a "map mod" in the game that accurately creates a zombie infested Disneyland.
Left 4 Dead site: http://www.l4d.com
Full article: Ruin (Improve?) Your Disneyland Memories With A Left 4 Dead 2 Mod