An Unexpected Party Favorite

There comes a time in many gamers lives that you invite company over to hang out, play games, have fun, and eat pizza. You then come to a realization that most of your games are single player, or online multiplayer only, and you start to panic. "What can we possibly play?" Although some games aren't inherently designed as a co-op experience, you can still have a blast doing so co-operatively. Here's an example of one such game.