World
World 1 was the first world open to the public, it featured simpler graphics, no deep water and no manual mine placement.
Players exiting the spawn room would always find themselves by the Ring of Brodgar, a ring of Stonehenge-like rocks.
Tree replanting, true Villages, civilization weakening wild animals, Decay and Scents were introduced later in World 1.
World 2 introduced Foraging, the Quality system, new skill values and attributes for crafting, more types of Trees, deep water and new terrain types. Boats, Scent decay, Charter Stones, status effects, and Travel Weariness were introduced later in World 1.
World 3 removed the existance of Ring of Brodgar as an optional starting place, althought the Stonehenge like structure still exists in every world.
World 5 introduced the Curiosity and Discovery system for gaining LP, and the spawn room no longer gave Bread and a Fishing Pole.
World 6 was introduced after an unexpected crash ended World 5. The only major difference is that Charter Stones have been removed.