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Bounty Hunter worlds are being swapped next week.
This thread was added on September 12, 2019, with posts from JagexAcorn.
Original Post
So do you just pick and choose whether it's weekly or fortnightly?
As per the PvP rota we swap world themes every two weeks. You can find more information here: https://www.runescape.com/oldschool/pvpworldrota