8
This one may be hard to intregrate because it requires it's own database.
The reason I say this is because I have tried for weeks now to figure out a way to intregrate a trivia.php file. It's only one file but that file calls to a database that was created for it. Maybe this one will work and I plan on trying it out myself. It all depends on how the code is written on the php file.
At least this script you found comes with good instructions and even several tutorial pages.