Just playing with my matrox settings using 3 screens. I know nothing about games but is it this game you using a full screen application, or is it online game in a browser, or whatever.
If it is full screen gaming i can only play a game on 1 monitor. But in saying this, if it isnt full screen application you can drag the gaming window across the 3 monitors, which in fact if there is more viewing area on the game you will see this new area you usually wouldnt see until you scroll across. (unless there is a setting i am missing i dont think you can configure full screen gaming over multi displays, which would be most optimal, correct me if i am wrong)
Post Your Desktop up
Here is my desktop screenshot from earlier. If i want to expand iTunes for example over the 2 or 3 monitors i would need unmaximise the window and drag until resized over the screens.
Question about multiple monitors
In this thread my image shows how you can arrange if you want 3 accross, or if you decide on 4 you can make it a 2x2 square setup. I can have 5 monitors if i wish on mine, but 3 is plenty.
EDIT: LOL same as you sniperchang, old thread...........well at least it gives readers options