A short video of the very first video game OXO, released in 1952, 6 years before the more widely thought first video game Tennis For Two and written by A.S. Douglas. The game ran on the Edsac computer at the University of Cambridge, it is not widely known as it could only originally run on the Edsac computer so you actually had to go to the University to play it. Now an emulator has been written so the original code can be used on modern PC's, which is what this video uses for the demonstration you see.
If you wish to try out the game for yourself, follow this link to the Edsac simulator.
http://www.dcs.warwick.ac.uk/~edsac/
The First Video Game: OXO - YouTube
http://www.youtube.com/watch?v=Pkiwn7u8i8s