Thank you so much! Level 7- do you mean near the end of the level on the right hand side where the wall covers the whole opening? - When bouncing up to it off your hat - recall your hat straight away after bouncing up. You should have enough time to pass through the wall as the hat will be in the air just long enough and you'll land on top of the platform.
I admit this level is a bit too obscure and I could of designed this level better . Let me know if you manage be do level 7 and level 8 :)
