What's the Name of That Book??? discussion

This topic is about
The Fairground of Dread
SOLVED: Children's/YA
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SOLVED. Children's Choose Your Own Adventure Books with a monkey guide [s]
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http://www.gamebooks.org/index.php
Quick google says:
The Castle of Fear
The Funfair of Evil (aka: The Fairground of Dread)
And perhaps:
The Island of Horror
or
Jungle of Peril
Monkey's name is Zetto
Details throughout the whole series: each scene took up a two-page layout and was illustrated scenes of dangerous-looking situations. There was a monkey guide/sidekick who appeared in (almost) every page, usually looking back at the reader with trepidation from the bottom corner. He had some sort of cutesy name. There were no other protagonists. Every scene gave you 2-5 (ish) options of where you wanted to go, with corresponding page numbers "(if you want to open the dungeon door, turn to page 23")
I remember, specifically:
- One book about a tropical island. There was a jungle with plenty of snakes, a wrecked ship on a beach, and an abandoned lighthouse. I also seem to recall some sort of creepy shack...
- A carnival at nighttime. Clowns, a merry-go-round with live animals. poisons, and a marquee with burnt-out lights.
- One the involved a haunted castle, maybe? I remember the outside of the castle, with ghosts, and a hallway with suits of armor that were actually alive. I think this one also involved a banquet table with lethal foods.
My brother and I were talking about them recently and he rattled off a few more than I can't recall right now. When I Google them, I can't find anything other than the R. A. Montgomery books, which are obviously not what I'm looking for.
Thanks so much!