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The reality is we made this with a very limited budget and for that reason we have not not yet implemented a mac/*nix version yet. This is primarily a research project to show that students can learn from video games. The goal is to prove to policy makers that technology can be used to improve education. FAS is open to any feedback you can give them about the game or if you can help get it into the classroom.
If you really need a different version consider donating or joining FAS [http://fas.org/member/index.html] so that we can continue development.