Do it, and if it doesn't pass, flip on 3 and do it again?
29 is harder; the trick there is to wait for it to finish spinning before trying the next possible combo; it usually finishes spinning in the same position that it started in
Hey - co-creator here. There's a great explanation for this in the Guardian column that features some of the questions. This is my favourite question because it's really hard, but once you get the explanation it's very satisfying!
I totally don't get Question 28. If I keep retrying it I can get it right sometimes by clicking the I Feel Lucky button really quickly, but I can't discern any pattern. "Almost done! Set this toggle to the ‘on’ position and hit 'I'm feeling lucky' to opt out of Cookies. If you are incorrect, the toggle will spin." What's the explanation to this one?
Do you know why it tells me it "tried to access my data 28 times" but won't let me retry the extra question I failed or tell me which one it was? There are 29 in total, no?