The private room: the default for a known group
When you already know who is playing, a private room is the simplest thing there is. One person creates it, picks the categories, and shares the six-character code. Everyone types the code in and you are playing — no accounts to exchange, no invites to accept, no waiting. It is the fastest path from "shall we play a quiz" to actually playing one.
Because the room is private, only people with the code can join, so it stays your group and nobody wanders in. This is the right choice for a friends-and-family evening or a team break.
The public lobby: meeting new players
If you want a game now and do not have four friends free, a public lobby fills the room with other people who want to play. It is more unpredictable — you do not know who you are playing against — but the quiz gives everyone an immediate shared footing, which is a far easier way to meet people than a blank conversation. Cameras stay optional, so you can keep it text-only until the room finds its feet.
Friend codes: building a regular group
Every account has a friend code. Share yours, add each other, and you can then invite friends straight into private rooms, message them, and see when they are in a lobby. Over time this turns one-off games into a regular thing — the same handful of people who show up for the Thursday quiz. You can also block someone, which stops them contacting you or joining your rooms, so the group stays the group.
Custom quizzes: playing your own questions
The built-in categories are a starting point, not the limit. The quiz editor lets you write your own questions and answers, add images, and publish the quiz so your friends — or anyone — can find and play it. A quiz about your friend group's in-jokes, a course you are studying, or a topic nobody else covers is often the most fun of all, because you made it for exactly these players. Published quizzes are reviewed before they go public.
Which one to pick
Known group, tonight: private room. No friends free: public lobby. Want the same people again: swap friend codes. Want it to be about your world specifically: write a quiz. Most groups end up using all four — a private room for the regulars, a custom quiz when someone has made one, and a public lobby when the usual crowd is not around.