rockwoofstone wrote:I'm currently stuck in the same place too, so you're not alone with your repeated exploring!
It is tricky. I thought I understood it, then I have realised (with a little conversation via personal messaging) I don't fully understand it fully at all.
I am doing it right & also doing it wrong at the same time. However I don't know specifically what the 'doing' / 'undoing' bit/s actually are !
I love this puzzle, I have even assumed it broken.......It's not apparently. So well designed It feels unfeasible.
When I see this core it's going to make me frown & grin so much.