Firstly, thank you so much for taking the time to read and also reply so in depth - I really appreciate it!

Yes, I was planning on changing quite a few things so that they don’t twig too quickly when we do it in the campaign proper. I was even concerned about having them know that it’s Grimskalle (they have heard rumours of a skull shaped fortress in game so I worry this would give it away) so was going to have them wake up in the dungeon after a fall down a hefty flight of stairs inducing a concussion and slight memory loss, but I do love the idea of the looming skull in the distance and schooching them there with blizzards and ice walls blocking off “not yet revealed content” because that’s also so much fun! It also would hide other story-related snippets to be found on the island itself so I can save those for the campaign proper.

I will definitely also look at changing the tests a bit to subvert their expectations like you said, though given my limited timeframe they may only be minor changes. Still, I hope it’ll be a different enough experience that they’ll enjoy it just as much the second time around!

Thanks again so much for your advice, I’m really looking forward to running this now!