Has anyone ever attempted a self imposed challenge when playing a game?

[Salnax]

Every so often, when I replay a game, I'll add conditions. Usually it's nothing too extreme. For example I've completed Final Fantasy 1 with just a Red Mage, beat Pokemon HeartGold with a team of Bug Pokemon, and did a True Pacifist run of Fallout: New Vegas. I also tried a Nuzlocke run once, and it was the hardest game I've ever played, in more ways than one.