I made a little Jeopardy game for my Sunday school class. A blue board full of dollar amounts seemed like a more interesting way to review the lesson than just asking the questions one at a time.
Everything is in one HTML file: the board, the styling, and a JavaScript array of questions, answers, and scripture hints. Clicking a square uses its row and column to find the question, opens a large overlay, and marks that square as used. There are separate buttons for the hint and answer, plus a countdown that turns the question red when time is up.
I added Double Jeopardy spots and a Final Jeopardy question too. The computer handles showing the questions, not all the classroom bookkeeping. Keeping it as a single page also means changing the lesson is mostly a matter of editing the question data. Much less setup than building a whole quiz system.