I game occasionally and these days I've learned a new word: speedrun. From Wikipedia:
A speedrun is a play-through, or recording thereof, of a computer- or video game performed with the intent of completing it as quickly as possible, optionally under certain prerequisites, mainly for the purposes of entertainment and competition.
At Speed Demos Archive you can find a long list of such recordings. They can be fun to watch, especially the ones for RPG games like Fallout or Baldurs Gate series.