In this area I'm going to post the links to the most maddeningly difficult and stunningly bad games I can find as I review them. The ones that make you want to drop kick a Labrador puppy into the rusty meat grinder of despair after playing for more than 5 minutes. These games will make you suffer, play at your own risk.
The Pain
Spongebob Boat-O-Cross
My review of Spongebob Boat-O-Cross
My Review of The Scourge Project (this one isn't a free game so I can't link you to the game itself, but if you really hate yourself it's fairly cheap on Steam)
The Suffering
Facade
My review of Facade