Contestants must guess the height of contortionists. Other challenges include transferring creatures from tank to tank; and navigating a surprise-filled maze.

Coffins, pitfalls and poison play roles in challenges.

It’s double trouble this week when siblings enter the dungeon and compete in some of the grossest, scariest challenges on television. Siblings team up to tackle four tanks filled with unknowns, donuts and more.

Using only their sense of timing, the contestants must jump over an automated stick that is shooting right for their shins then, sitting in a tub of cold water, the contestants must correctly identify three items that are dumped on them.

Instead of making contestants identify weird objects, they must count them! Whoever guesses farthest from the actual number of items will go home.

The teams try to guess the weight of various creatures, and later have to identify items placed around their heads. The final challenge is a maze filled with mousetraps.

Memorable contestants from previous episodes return for another shot at the grand prize.

Contestants confront their fears and phobias during challenges.

Players begin by identifying objects placed in tanks. The next round requires those who survive elimination to use their mouths to retrieve plastic rings from creepy boxes. The final challenge involves a booby-trapped maze.

Parents team up with their kids.

Weird donut fillings must be identified by the contestants, who later transfer creepy critters from one tank to another. The final challenge involves a creature-filled tub.

Contestants wear straitjackets for the first challenge, which forces them to use their tongues to identify objects. Later, they try to guess the weight of a dangerous animal; and have to figure out what's being dumped on them as they sit in a tub filled with water.