I never used the Quiz Buffet, so am not sure I even remember exactly what it looked like. If you click the link to Trivia Quizzes and scroll down, you will see a section called Popular Quiz Selections. Further down come Newest Quizzes ,and then Topic Mashes for a selection of categories that changes each hour. The left side also has links to what are called Trending Topics, which are actually quizzes, presumably some which have recently had a number of plays.
Aha, testing the links on that page that read Popular, Mixed, Random led me to see a page titled Quiz Buffet at the Random link. So it takes two steps from my home page (one of the other ways for setting up your home page may reduce this - I use Condensed) - first select Trivia Quizzes, then Random.
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(Editor in Humanities, Religion, Literature and For Children)
That's all, folks!