There are gamers who don’t enjoy the games the same way the average gamer does. They are called runners. And they are doing Speed-Runs through games.

For example: the complete HalfLife 2 in 1 hour 36 minutes and 57 seconds…

And there is an archive to give you an insight on what is going on in the speed-run-scene:

“SDA is the home of speed runs done on many computer and console games. A speed run is a video of a player striving to complete a video game in as fast a time as they can manage. Sound easy? It’s not! A large number of tricks are usually used, possibly skipping whole areas of a game in the process, and there will always be mistakes.”

Source: http://speeddemosarchive.com/