One of early games demoed by RIM at CES2011 – Quake III Arena is now available to sideload. Thanks to sergeh from CrackBerry Forums who managed to compile Quake III source files which was earlier uploaded at Github by RIM.

* You need BlackBerry PlayBook 2.0 Beta to play this game

Download Quake III Arena BAR >>

Instructions (by sergeh)

1. Sideload bar Side Load PlayBook Apps (Windows)
2. We need to create a folder and a subfolder in /misc like so /misc/quake3/baseq3
3. If you have a legal version of Quake III Arena you may transfer your pak0.pk3 from the installation cd (found in /baseq3) to the baseq3 folder on your PlayBook. Otherwise you can use the demo .pk3 found here
4. Start the game!

Custom maps for multiplayer
Download any maps you’d like from Map Factory – the game map database and copy them to your /baseq3 folder

Source: CrackBerry Forums