Holy moly! This game is a RIOT. Great job, man!
My modifications: I use stamps in my class so for about 10 minutes or so of review I let the students answer questions like, "What is Chile famous for?" in full sentences to get stamps. Then, to make the game more interesting for all the teams (my girls are really smart and would probably get all the questions right), I don't let one team answer over and over again. What I do is make the girls write the answer down first, then stand up and show me that they wrote it, then say it. Any team can try for any question, and it's always a race to see who is first. Oh yeah, and I DON'T show them the choices on most of the multiple choice questions, which makes it more fun too.
<3-Kat