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Dig it up
Punch a block and it breaks. Sometimes a seed falls out. Plant it, wait, and a tree grows while you sleep.
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Lock it down
Drop a World Lock and the world is yours. Put your name on a sign, a door to your friend's place, an entrance for guests.
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Play together
Trade, start a guild, run a dungeon with three friends, go fishing, or hide as a block at the circus and hope nobody punches you.