A 100% Vanilla hack.
It has 35 Exits and all of them are one room kaizo challenges. It is supposed to be more of a challenging hack with a really sharp difficulty curve. The first 7 rooms are pretty easy but after that the difficulty increases drastically.
This is a fun hack in the "short, precise levels" subgenre of kaizo. When the author mentions that the difficulty ramps up, they really, really mean it. Starting around level 28, it sometimes becomes as much about figuring out the puzzle of what you're supposed to do as it is about executing it. The last line of levels might take some folks over an hour or two each, and the final boss is extremely precise and difficult. I'm actually not sure how it's supposed to be possible without the mushrooms given to the player just in case you need them.
Thank you for fixing some of the things I mentioned in the first version, particularly removing the no-yoshi introduction screens. I noticed, by some of the alterations, that I cheesed some levels in my first playthrough, so it was interesting to figure some levels out a second time.