I would assume that you have to get 9-0 every weekend to be able to go there.
Makes sense, because you could dominate one weekend and get a major ass-whooping the next.
I don't think it should be an one-time unlock. You ought to work your ass off every time.
English
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My assumption is that it would stay unlocked, but you'd have to go 9-0 again for the chest.
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I guess that would be fair too.
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I liked to explore the area but apparently we have to re-unlock the lighthouse each week