With the Xbox One and PS4 still relatively young, it seems like a good time to talk about killer apps. Killer apps refer to a software or program that compels consumers to buy the new hardware that is required. Of course, the killer apps in the gaming industry are the games that convince you to buy the hot new console or platform. There are valuable lessons to be learned from killer apps. They can make or break a console. This a list of killer apps that have stood the test of time and are still just as fun to play today as they were back in their day. This is not to be mistaken as a generic "best games" list. To be on this list, the game had to be used to promote a particular console or service and stand the test of time. Some of the entries on this list were packaged with the consoles they were trying to promote. Best of all, all of these games are available now on a digital distribution service for a fine price. See which killer apps are still worth your time and money.