27 Dead Rising
One word: lawnmower. Dead Rising gives you dozens of ways to hack, slash, burn, and smash an endless legion of zombies into bloody oblivion. Then it lets you go outside and grab a lawnmower. As sure as dead corpses will rise and gorge themselves on human flesh, grinding undead bone beneath a happy red snapper just never gets old. And, on the off-chance that it does, the game's hilarious and inventive achievements (i.e. "Raining Zombies: Knock at least 30 zombies aside with a parasol") will keep you grinning all night long.