Donkey Kong Country on the SNES, section 4
This video consists of 3 stages: Orangutang-gang, Clam City and Bumble B Rumble. I stopped before Gorilla Mountain because you won't be able to save for a while once you go there.
I had no idea that Orang-utan Gang had FIVE Bonus Rooms! That's crazy. You have to make use of one barrel to get to three of them, so maybe that's why I couldn't find them before...
I understand that I can be late with annotations, but remember that when I upload these, I often don't check everything as it finishes as I could be off doing something somewhere else.