That kind of screw are named "external torx", and come on! they very easy to take! and you can make your own "gamebit".
You just need a cheap new or used thin flat screwdriver that fits in the hole of the screw and an old trusted dremel to make a cut on the flat part and VOILA! Your own nice and durable gamebit!
Forget the plastic pen trick (it breaks in a few uses) or spending money and have to wait days for the mail and make your own gamebit today for cheap. Here's a picture of my gamebits. I own a video games and computers repair shop since 2000 and I make my gamebit screwdrivers since then and I use them almost every day.
please comment if my instructable helps you.