Hidden Demo!?!

[Sword_Gun]

Hey, my freind gave me a XBOX Magizine Demo disk. Its the May 2005 Disk 44.
The games are: Doom 3, Psychonauts, Dark Watch,and Pariah.

In the inside it says theres a Hidden demo on thie disk, Ive searched for the hidden demo for like hours... Can anyone tell me How to find the hidden demo on the disk, and what game it is?


Thanks.

[Dave]

You have to enter a code on the main menu screen. Google it, I think there is a list of codes somewhere.