From the Super Mario Wiki
Excitement Central is the first world in Wario World. Since this is the first area the player visits, it is a tutorial for items and moves. The first level, Greenhorn Forest can be accessed by a giant tree stump in the middle of the area, while the second stage, Greenhorn Ruins is located in a temple entrance to the left. Excitement Central was created as a result of the black jewel's powerful dark magic. To access it, Wario must enter a large door in a forest-like area of Treasure Square.
Excitement Central is set in a dense forest with tall trees and wooden bridges over lakes and waterfalls, as well as a temple. Once the two stages are beaten, Wario can fight Dinomighty and recover the first Giant Treasure Chest Key.
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