Every world Adventure Mode can run: the bundled packs that ship with the game, and the community's creations. Import any of them with one line at your table.
Bundled packs ship with the game: say new game at your table and pick one.
The family friendly badge is also a size promise: those worlds run short seasons - a real ending every dozen or so play nights - and are built to replay, re-dealt, so the second run surprises a kid who knows the first one's twist.
Community packs import with one line - copy it from the pack's card and paste it to your GM (from the Tavern or mid-session): the pack is copied server-side, its GM secrets never touch your chat, and new game then offers it. Want to make one worth sharing? Start with the craft guide, then --eject-pack at your table and open a PR - standout packs get pulled into the base game, with credit.