OpenSonic is a free open-source game based on the "Sonic the Hedgehog" universe.
It introduces a different style of gameplay called cooperative play, in which it's possible to control 3 characters simultaneously.
See http://opensnc.sourceforge.net/home/index.php for more details about it.
Thanks to Hitnrun who ported allegro to pandora, i've been abled to modify
a bit OpenSonic (mainly to get a fullscreen and to add frame skip option) and run it on my pandora.
It might be good to overclock a bit for better performances.
Sources are included, and this package is under the GNU public licence,
read license files for more information about it.