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In Caveman Club I am unable to unlock Bison Barrow, and all the remaining locked lands are no longer showing what is required to unlock them.
I would contact Customer Service.
How do you contact customer service now? I don't see it.
The best way is the tab above your farm (right side). Click the tab and there should be a red Contact Us button.
If there is no Contact Us you can use this link but there will be more to fill out.