What you need to do
http://zunedevwiki.org/wiki/getting_started/end_user/installation
Doom game
http://www.zuneboards.com/forums/download-openzdk-applications/50582-doom-zune-hd-1-2-a.html
gb and gbc emu
http://visualboyzune.com/tiki-index.php
...
https://www.youtube.com/watch?v=-98Ux1WhDmQ