Call of Duty: Modern Warfare 2 Easter Egg - "Super Mario" video game

First, go on the multiplayer-map "Estate" and enter the main house (big one on top of hill). Stay in the living room and go over to the big tv. Then, on top of the drawers there will be a gaming console called a "Gamestation." Beside it there should be a small pile of games. Finally you should see a game called "Italian Plumber Princess Rescue" (obviously Super Mario).