About undefined island

how to unlock undefined island that looking like gray old temple?
and orange boiling water is washing down like waterfall
and what is the last stage of the kelvintaph glacier

The last stage of glacier is I think kelvintaph defiler and you cant currently unlock the volcano world


No its not kelvintaph defiller.

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Um I think it’s treasured in ice but its not the special one that makes you go to the next map

That’s the volcano area. You can’t get to it yet.

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You can’t unlock it. It’s not out yet. So I’m pretty sure once you’re done with glacier, you’ve finished the game.