You can now tinker with the code of 'Commander Keen's' lost episode
 

It's easy to indulge your Commander Keen nostalgia with most of the game series, but the "lost" Keen Dreams episode has proven elusive outside of less-than-official copies. As of now, though, you can do something about recreating those adventures...

http://www.engadget.com/2014/09/18/k...=rss_truncated