How to enable 3D acceleration in VirtualBox

Well today i was just messing around with my VM, working on an assignment, and i discovered (finally) what i had missed when trying to activate 3D acceleration.

At the time i assumed it was an automatic feature, that as long as you had the latest version of VirtualBox and the guest additions it would run. This turned out to be false. I found a check-box hiding in the Virtual Machine's settings which enabled the 3D acceleration and eliminated the messages i was getting about the video adapter not having any 3D acceleration. Here's a screenie of the offending checkbox:
Check this little beauty, have the VirtualBox guest additions installed, and you're good to go. Note that VBox's Mouse Integration (MI) feature seems to cause the mouse to play up in games, so i found turning MI off during games was the most effective way of solving the problem.

The performance is pretty mediocre, as you would expect, but everything works for me (apart from the mouse bug). Here's a screenshot of one of my all-time favourite games to prove it, running in VBox (Freelancer):
The rest of the process i hope i explained well enough in my previous post, but if not just drop me a comment.