BUzz platinum was definitely a pain in the ass. The worst was the 50 multi (local) games played.
I browsed the net while doing it. I just held my fingers on the top button and pressed it as soon as I heard some muttered question.
During the 5 (was it 6?) rounds I only paid attention during the pie fight. At that point you decide whose the winner of the whole show.
Cause when you reach the final quiz you dont have to press anything, just wait till the loser (or at least the one with the least points) goes automitically down.
It makes it much faster in attaining the 50 MP trophy rather than playing it seriously.
Thats how I did it. If you get my description that is.