With the demise of adequate difficulty settings in many game series (or, in the presence of those, the rise of some seriously hardcore gamers), game fans old and new have been searching for ways to mix up their favorite games.
Enter the challenge run! Some are simple, single rules, and others are lengthy lists of restrictions. Some are near impossible and others are pretty easy. There are so many out there that it is not possible to showcase them all in one article, but here are some awesome choices for those of you interested in giving a challenge run a whirl!