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Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
Fat Guys make their first appearances in Super Mario World 2: Yoshi's Island level Lakitu's Wall, and are uncommon enemies throughout the rest of the game. They come in two colors: red (which initially walk but will run if Yoshi stands on them) and green (which are always running). Fat Guys simply walk or run back and forth continuously, changing direction when they encounter a wall or a margin, unlike regular Shy-Guys which walk around and may stop and turn back on their own will. They are able to damage Yoshi if they bump into him, but Yoshi can attack them by eating and ingesting them. If spat back, they will resume their behavior.
When Yoshi has three Giant Eggs at his disposal, all of the Fat Guys will disappear until Yoshi uses at least one of the Giant Eggs.
Fat Guys reappear in Yoshi Topsy-Turvy, where they appear distinctly larger, being now roughly three times the size of Shy Guys instead of two. Unlike previously, they do not run after being jumped on, though Yoshi can bounce off them like a trampoline.
Yoshi's Island DS
Fat Guys return in Yoshi's Island DS, where they behave similarly to their first appearance.
Yoshi's Crafted World
In Yoshi's Crafted World, red Fat Guys appear in Poochy's Sweet Run and Poochy's Magma Run and can be seen with different behaviors. Some simply walk back and forth on the ground and will start running after being jumped on, much like in their original appearance. They can be defeated by throwing an egg at them, charging into them with Poochy, eating and turning them into eggs, and Ground Pounding them. Ingesting a Fat Guy will fill Yoshi's egg stash instead of granting one Giant Egg like in past games.
Other Fat Guys stand on the sides, pushing rectangular cutouts in Yoshi's way and rising them back up after a short time. Yoshi can hop on these objects while they are down and use them as platforms, and even ride them upward as the Fat Guys pull them back upright, much like Whomps can be used in New Super Mario Bros. and New Super Mario Bros. 2. In some cases, Fat Guys push these objects onto thin stilts and create a platform over a dangerous pit.
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