Zombie Uprising - a game within a game

Sarcastic Gamer has the "ItsNotAReview"

Call of Duty: World at War isn't the only game to include a Zombie mini-game. Saint's Row 2 has included a playable arcade cabinet game called Zombie Uprising that can be found in the in-game “Adult” Store .

Not only do you get to shoot hundreds of zombies in the face with various weapons including AK-47 rifles, pistols, shotguns and even a Gatling gun type minigun. A friggin Gatling gun! You also get access to melee weapons like sledgehammers, machetes, baseball bats, grenades and even a chainsaw! A friggin chainsaw!