Quake 3 is finally been ported over to PlayBook by a awesome developer "Sergeh". Big thank you to u bro.
Requirements to run Quake3 on PlayBook: The game works only on OS 2.0
Sideload Quake3 bar file Quake3-1_3_3_1.bar
Here are 3 different ways in which you can install .bar files.
Create a folder and a subfolder under Misc:
You are good to go. Enjoy the game :)