Don't know if this is correct but its what I'm thinking. I don't think its possible to play 'Cube games that have been burned onto a DVD and put into the Q. I think the Q's DVD player is for movies only. Since it looks for 2(3 if you want to count CD's) diff. formats. If its either a movie or a game. This isn't a PS2 which plays DVD games and reads DVD movies. But that's just my take on it.
*edit* Errr...I think I typed this eerily simliar to what Shadow said
