Let's Play Half-Life Upside Down [video]

Games are not the usual fare on Hacker News, but with this creative twist I believe it would qualify as something hackers (and nostalgic Half-Life fans) find interesting.

Part two and three are located here:

https://www.youtube.com/watch?v=NBIZt8Pp31Q https://www.youtube.com/watch?v=ZO5_Cv21KsQ