World 3 (Paper Mario: Sticker Star)
From the Super Mario Wiki
World 3 is the third world Mario explores in Paper Mario: Sticker Star, located west of Decalburg. It is the biggest world in the game, with a total of 12 levels, which are located in a forest. After the Sticker Star is split, the third Royal Sticker ends up on top of Gooper Blooper, the world's boss. He then started to create poison, which ended up affecting the nearby forest and its inhabitants, including Wiggler, who is split into segments by Kamek because of his ability to cross poisoned areas without taking damage. The goal in this world is not only to obtain the Royal Sticker, but also to find Wiggler's segments and restore Wiggler's body.
Enemies like Clip Guys, Paint Guys, Ninjis, Poison Bloopers and Scuttlebugs are only found and fought here, while Shy Guys, Snifits and Piranha Plants are first encountered here. The forest's sticker shop is also where Secret Door stickers can be purchased. Gooper Blooper is fought near a rocky shore beyond the remains of a fishing boat that it destroyed. After Gooper Blooper is defeated, the poison and the darkness which accompanies it are purged from the forest, and any Poison Bloopers are replaced by Snifits or Shy Guys.