An open world out of a seed: woods, hills, sea and islands. Gather, build, eat - and be indoors when night falls. A world is kept on the server: the host saves it, and it saves itself when the last one leaves. Friends walk in through ROOMS while you play.
Music in the wilds: "Morning" and "Midnight Tale" by Kevin MacLeod (incompetech.com), licensed under Creative Commons: By Attribution 4.0.