A class trip to the Amazon rainforest seems like fun, until "you" and your friend Zoe encounter a gargoyle that sends you running off on one of two jungle adventures, either into a cave hidden behind a waterfall, or to a magical fruit tree that bears fruits which turns humans into fish monsters.
A few of the monsters in the book, such as the hostile Muglani tribespeople and a crafty leprechaun-type creature called Cronby the troll, notably had a cameo in the 2015 movie adaptation Goosebumps.
Deep in the Jungle of Doom provides examples of:
- All Trolls Are Different: You'll run into one troll named Cronby, who seemed more in common with gnomes, leprechauns or goblins. You can instantly get a good ending in the second storyline by solving Cronby's riddles — provided if you are savvy in Goosebumps knowledge.
- Always a Bigger Fish: Being pursued by the Muglani tribes, you can choose to hide in a dark cave, which the tribespeople are afraid to enter. Turns out the cave holds a powerful monster that devours you afterwards.
- Animorphism: This stands out in the series, showing the changed form (a Creature from the Black Lagoon-esque creature) on the cover. It also includes an ending where you're turned into a monkey.
- Cave Behind the Falls: Choosing the second route (flee from the stone lion) and you will end up in a hidden cave behind a set of waterfalls, where majority of the second storyline takes place.
- Cave Mouth: In one of the bad endings, the cave where most of the second route takes place turns out to be the mouth of a giant monster, who then swallows you in one gulp. To make it worse, "your" friend Zoe betrayed you and allowed you to enter the "cave" knowing very well that it was a monster's mouth.
- Covers Always Lie: The first route has you being turned into a fish monster, but it describes you as a gray fish monster, while the cover depicts you as having purple/magenta skin.
- Doomy Dooms of Doom: The title itself, Deep in the Jungle of Doom.
- Failure Is the Only Option: There are two times when this happens.
- If you refuse to accept the help of a warrior tribe, you either get captured by them and have your heads shrunken, or you die in a tar pit.
- If you find the tiger skeleton pit, you will either get killed by the tiger skeletons, or have to keep singing to keep from being attacked. This can happen in both storylines. In one storyline, you can get out of the pit before this ending, but it also leads to a bad ending.
- Hungry Jungle: The titular jungle is filled with hazards, and Everything Is Trying to Kill You; stone lions, angry natives, tiger skeletons, a giant bat, man-eating plants...
- Intercontinuity Crossover: Cronby the troll's puzzles specifically references events from the original Goosebumps books. Specifically, the sister's name from The Cuckoo Clock of Doom and the weaknesses of the gnomes from Revenge of the Lawn Gnomes.
- Leprechaun: Cronby, despite being referred to as a troll, has more in common with this instead. His mischievous demeanor and love for shiny gold, and the good ending where you earn gold nuggets from Cronby by answering his riddles, seems closer to the traditional depiction of leprechauns. His later appearances in later Goosebumps media such as Goosebumps HorrorTown enforces it even further, where he's depicted as wearing the traditional green Irish outfits commonly associated with leprechauns.
- Little Bit Beastly: In one of the good endings, you managed to consume the fruit which turns you back from a fish monster to a human again. But after returning to camp, you realize you still have the ability to breath fire, a holdover from your brief time as a fish monster.
- Living Statue: Which kicks off your adventure in the first place — you and your friend Zoe comes across a living stone lion, and when you looked closer to investigate it, the lion comes to life and chases you across the jungle.
- Man-Eating Plant: One of the endings have you hiding in a giant flower to evade hostile natives. Unfortunately, the flower is alive, and swallows you on the spot.
- Morton's Fork: In one section, you can get trapped in a pit with two living tiger skeletons (Wait, tigers, in the Amazon? They're supposed to be jaguar skeletons!). Your only choices are to try to jump out of the pit, and escape by jumping on one of the tiger skeletons, and then out of the pit, or to sing to the skeletons to calm them down. The former leaves you too badly injured to move, as the skeleton breaks the second you land on it (you automatically kill the other one with your remaining good leg), and the latter works at first, but you soon realize that the second you stop singing the skeletons will want to kill you again. Ironically, both endings imply there should be a way out of this; simply sing to the skeletons and then kick them, but there is no third option.
- Muggle in Mage Custody: In one of the bad endings, Cronby the Troll hypnotizes you, making you his slave.
- Music Soothes the Savage Beast: One choice when faced with the tiger skeletons is to sing to them. This works, but the second you stop they are no longer soothed, so you have to keep singing to them forever if you want to live.
- Mutagenic Food: The fish-monster storyline is kicked off when you ate an irresistible pear... which turns out to be cursed. It turns you into a fish monster, and you can only turn back by eating a pink fruit.
- No Good Deed Goes Unpunished: At one point, you and your friend Zoe are about to enter a suspicious-looking cavern. If you chose to go first and provide cover for Zoe, you will be ambushed and eaten by a vicious monster as Zoe betrays you to save herself.
- Quicksand Sucks: A variant, but another bad ending have you and your friend Ben getting stuck in a tar pit and drowning.
- Shrunken Head: More than one bad ending with you getting captured by angry natives will have your head removed to be preserved as a souvenir.
- Taken for Granite: One of the bad endings where you chose to steal a prized hourglass from the tribespeoples' king will have the king cursing you, turning you into a limestone statue.
- Timed Mission: One of the escapes from the tribespeople storyline have you accepting a challenge from the tribespeople's king to find three gold nuggets within an hour. If you succeed, the king will let you go, leading to a good ending where you get to brag about your adventures.
- Witch Doctor: The Muglani tribesmen are witch doctors who intend to collect your body parts for their rituals.
- With Friends Like These...: One ending has your friend Zoe taunt you about being too scared to go into a cave before her, and when you do you hear her voice acting like she's feeding someone, and then the cave closes, because it's not a cave — it's a monster's mouth.
