20,000 Light Years Into Space is a steampunk-themed strategy game 
where you have to manage a steam supply network. It is written 
in Python and runs on Windows and Linux. It was first released 
in 2006, and won second prize in the Pyweek game programming 
competition. It is free software, licensed under the GNU GPL 
version 2. It is now being distributed with the Debian and 
Ubuntu operating systems. There is a story for the game. 
Light Years includes an interactive tutorial; you can also 
read the instructions and a bit of history about Light Years.