The situation Xia Kun faced was not something unique, as in this world the cruel law of the jungle was present everywhere. This was probably also the reason that they were all thrown into this world for trials, without external interference, it was almost impossible for those without any background to reach far.
As for the cooperation between participants, that was considered impossible, as each was thrown in different areas and affected by unique causes and effects. This would make it such that even if they were to be in contact, it was impossible to collaborate. No one was foolish enough to add more enemies to themselves.
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