World 1A is one of the most well known Worlds aside from World 0A due to how easy it is to enter. It is comprised of an endless forest. The exact species and density of trees found in World 1A varies wildly and depends on the person who entered it, when they entered it and where they entered it from. One consistent factor is that the trees are always dense enough to consistently cover the ground in shadow.
Meeting others in World 1A is known to be difficult. It frequently splits up groups by rearranging itself or by forcing a few people, but never everyone, into other Worlds. This is by no means a unique property, but World 1A is one of the nearest to World 0A, that exhibits this property. Some theories suggest that a major factor in how World 1A splits people up is its ability to alter explorers' state of mind. This behavior is not confirmed to exist and could be a side effect of other properties of the World, but there is evidence to support this theory.
Such evidence includes an unusual air composition of World 1A. It contains a far lower amount of oxygen, potentially leaving explorers deprived enough of it that their brains simply begin to work slower. That take is supported by explorers' reports of memory loss and trouble with critical thinking, or thinking at all, while in World 1A. Another possibility is that this reported altered state of mind is due to entirely external factors, discussed in detail in the "appearance" section.
World 1A's appearance is that of a dense forest. As discussed before the World varies a lot based on many factors. These factors include season (discussed in detail below), place and seemingly, the person themself.
There is one known phenomenon present in World 1A known as the "Growl". It makes noises that sound like animals, usually dangerous ones (think bears, wolves), almost always in a way that makes them appear hostile and reasonably nearby, but far enough, that running is an appropriate reaction. In spite of the threatening noises, there are no known cases of the Growl actually harming anyone.
There are two worlds and one subworld connected to World 1A: World 0A, World 2A and World 1AA
World 0A can be entered randomly by wandering the forest or by climbing onto a tree, finding a large clearing and moving towards it. Notably the clearing should contain something more than just grass and on cloudy days the sky mustn't clear up in the direction of the clearing as otherwise there is a high chance that the clearing instead leads to World 2A. World 1A can be entered from World 0A by simply wandering into a forest. There are certain locations known to connect to World 1A and it is recommended to familiarize yourself with them.
World 2A can be entered very similarly to World 0A, this time by searching for a large clearing with nothing, but an expanse of grass and, on cloudy days, trying to move towards where the sky clears up. One can return to World 1A from World 2A by simply finding a forest in the plains and walking into it. Although it's important to avoid forests that are too dark and dense as those very often lead to World 3B.
World 1AA is a subworld of World 1A. It can be entered by climbing a tree that stretches into the clouds, if there are any present in the sky. Returning back to World 1A is as simple as climbing back down, although it often takes you to a different location than the one you entered from.
But then I had a very good idea: I drank coffee. See drinking coffee gave me a whole new caffeine intake and allowed me to complete tasks I wasn't able to complete before.
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Forest image licenced under CC BY 2.0 and uploaded to wikimedia by Hannes Flo