I found a link on digg.com to one of the first computer games developed. Spacewar was developed in 1960 and is kinda cool. It took some getting used to.
Just a quick starter for you… Once you click on the button, one person controls the first spaceship with a,s,d,f, and the second person controls the rocket with k,l,;,’.
I didn’t read the readme at the top of the page and it took me a good 35 seconds to figure out what buttons to push.
Click on the link at the bottom of this page to get started.