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The basic question, can you play the new LiF:YO as a single player, solo?
The basic answer, yes, you are marooned on an island and have to survive. That is the game. Solo play means no combat with other players. You can harvest, craft, and build all you want. So yes, you can play solo, sandbox style.
Can you "level" by killing monsters? No, there are no monsters. There are no quests. There is only you on the island, with a few wolves and other animals. Wolves can be dangerous, but you can't make a game out of killing wolves. There just won't be that much combat.
So yes, you can build ginormous sandcastles with infinite intricacy, but no one will see them but you. Unless you open your server up to other people.
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2024: 47 years on the Net.
Comments
I think the limit is around there for this version of the game. They 're building a full fledge mmorpg.
When the MMO released will come, there should be server for 10k players where it take a hours of real time to go from one location to another without horse.