Metal Gear Solid 3: Snake Eater HD Edition Cheats

1964 ... with modern day magazines
If you look around in the military bases throughout the game (Groznyj Grad, Graniny Gorki, etc.) you can find several modern day gaming magazines on tables, including EGM, GMR, and a few others. Shoot these magazines with a weapon and they will open to a page about Snake Eater. Shoot them again and they will flip to the back cover.