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

[TheEvilBanana]

Gnac said:

Completing Super Mario World without activating Switch Palaces

Getting through Zeldas without picking up heart containers (3-heart run)

F-Zero GX Story Mode (just playing it)

Getting a population of 500,000 in SNES Sim City without plopping any gift buildings (some maps had ley-lines where "tops" were sure to develop, and I discovered them)

I've done these.