Legion Defender is a two player game where one player acts as a hacker, and another a victim who must defend against the hacker's attack.
MS Windows, Mac OS X
The game is a single python script which contains both the hacker and defender game clients. The hacker can be run on Windows or OS X, but OS X is required for the defender. See the README for me details https://github.com/amrox/GGJ2015/blob/master/README.md
See instructions here.