Greenhorn Forest is the first level of Wario World as well as the first level of Excitement Central. The stage is set in a forest, where basic enemies are fought and the mechanics of the game are explained. The collectibles are relatively easy to find as well.
The level begins in a bushy area with some tree stumps. Shortly to the right is a climbable tree that leads to a wooden platform with some Magons and columns. The pink treasure button and its corresponding chest are also up here. To the right of the climbable tree is an imprisoned red Spriteling, who Wario automatically rescues. Ahead of the Spriteling are some tree stumps that Wario must platform over, leading to the first Gold Statue fragment. After that, Wario comes to an area with some Magons. Behind them is a climbable tree stump leading to another Gold Statue fragment. To the right are more Magons, along with the red treasure button, its corresponding chest, and a wooden chest with coins in it all right next to each other. Further ahead is an area with wooden platforms and climbable poles. Down below is another chest with coins as well as the yellow treasure button. The yellow chest is up above on a wooden platform. Past the poles are more Magons, the yellow Spriteling, and a trapdoor leading to the first sub-level in the game, which houses both the first red diamond and a Gold Statue fragment.
To the right of the trapdoor is a Garlic Dispenser and an area with some Rock Blocks and another trapdoor. Inside the trapdoor is another red diamond and Gold Statue fragment. Beyond the blocks is the green treasure chest's spawn point and a Bunny Spring that leads to an area with the green Spriteling, a Triceratops, and the third trapdoor. To the left of the trapdoor is a wooden chest with garlic in it, and even further left is another Bunny Spring, which leads to area with some Cractyls and another trapdoor, which has another red diamond and Gold Statue fragment inside. Near the trapdoor is the chartreuse treasure chest's spawn point and a climbable tree. The tree leads to two sets of wooden platforms. The ones to the left have some Magons, a Triceratops, and the chartreuse treasure button. The ones to the right lead to a Gold Statue fragment, some Magons, and the green treasure button. If Wario drops down from where the button is, he will end up back by the third trapdoor.
Up ahead are some Magons and a Garlic Dispenser. Further ahead is a puddle with even more Magons and two large rocks. The rock on the left has a Gold Statue fragment hovering over it, while the rock on the right has a trapdoor on it. Behind the puddle is a wooden chest with garlic and a climbable tree which leads to a wooden platform with two Triceratops, two Sculptures, and the cyan treasure button. To the right of the puddle is a Bunny Spring which Wario can use to get over some fallen logs. Beyond the logs are some Cractyls, the cyan treasure chest, the purple treasure chest's spawn point, and the blue Spriteling. Behind a fallen log near the Spriteling is a trapdoor. Ahead are two bridges, but which ever one Wario tries to cross will break, dropping him into Unithorn's Lair. However, it is possible to avoid falling with a well timed Corkscrew Conk. The bridges lead to an area with a Garlic Dispenser, the purple Spriteling, and the goal. As long as Wario has at least three red diamonds, he can remove the Stone Doohickey and fight the boss, but there are more collectibles beyond this area.
Past the goal, there are some Rock Blocks, the blue treasure button, and a trapdoor. Further ahead are some Magons, a Triceratops, and a wooden chest with coins in it. Behind the chest is a climbable tree which leads up to a half of a log laid out like a bridge. Wario can jump off of the log to land on a tall stump with the purple treasure button. Going left from the half log leads to an area with Triceratops, Magons, and the final trapdoor, housing the final red diamond in the level as well the final Gold Statue fragment. To the left of this area is a thinner half log which leads to a wooden platform with Magons, an Ankiron, and the blue treasure chest.
If Wario reenters the level after defeating the boss, there will be a set of ByeBye Balloons at the beginning that will take him to where the fourth trapdoor is.
Red diamond sub-levels
Gold Statue fragments
Names in other languages