Even if you're a die-hard Nintendo 64 fan, this fan-made mod for Super Mario 64 is more challenging than you would ever expect. Super Mario 64 Multiplayer adds Luigi as a playable character, introducing a co-op mode to Nintendo's landmark 3D platformer for the first time and unleashing sheer chaos in the Mushroom Kingdom as part of the process.

The internet can be an awesome place from time to time. I never cease to be amazed at the sheer ingenuity and dedication of fans who are passionate about their interests, and today we have a great video game example of this phenomena. Super Mario 64 was an instant classic when it was released in 1996, and it was incredibly influential to the 3D platforming genre. Great as it was, though, it was missing one thing... co-op! Even the remake for Nintendo's DS system didn't fix this tragic flaw.

Though the Nintendo 64 isn't exactly regarded findly by most modern gamers, it was an excellent gaming system. There might not have been a huge number of co-op games for the system, but the ones that were available provided great opportunities for teamwork in a variety of ways.