Chestnut Valley is a location in Paper Mario: The Origami King. It is located in the blue streamer district, found directly below Autumn Mountain. When Mario, Olivia, and Bob-omb reach the bridge connecting to the Water Vellumental Shrine section, a Paper Macho Goomba appears on the other side. Thinking it is friendly, Bob-omb runs toward it only to be knocked off the bridge. Mario has no choice but to jump off the bridge and rescue Bob-omb multiple times from different areas of Chestnut Valley. Portions of the Super Mario Bros. 3 athletic theme are used in this location's theme.
When Mario lands in Chestnut Valley, Olivia requests they follow the path ahead to find Bob-omb. To begin, Mario must head left to the first rolling chestnut section. Olivia notices something rolling toward them. She thinks it is Bob-omb, gets excited, and runs toward it, only to find out is actually the first of many chestnuts here. Fortunately, this path is big enough for Mario to dodge the chestnuts on his own. He can also use the small opening in the northern wall to wait for a set of chestnuts to roll past. The next chestnut section leads to the left, and is much narrower, requiring Mario to use the opening to avoid being knocked off, then use his hammer to hit a crack just ahead, creating another opening. When Mario gets to the top of the slope, it is revealed the chestnuts are coming from a tree guarded by an origami Goomba.
To the left is a ledge with a Heart Mario may pick up before moving on to the next section, which features chestnuts dropping from overhead trees with rhythm. After making it halfway through, Mario must drop down onto a platform Bob-omb is wedged into and pull him out. He apologizes for slowing them down, and Olivia tells him to be more careful next time. At the end of the next chestnut section is a Save Block and a tree guarded by an origami Goomba. However, when he notices Mario, he climbs up the tree. If Mario hammers this tree, the Goomba falls down, as well as three origami Galoombas Mario is forced to battle.
When traversing through the next section, Mario must run down a slope just ahead of chestnuts. Eventually, Bob-omb slows down and is knocked aside by the chestnuts. Three chestnuts then come in from the other side, trapping Mario and revealing a Galoomba in each chestnut. At the end of this section is a small area Mario must navigate carefully to avoid the chestnuts. There is a Goomba rolling a chestnut in the back to try to hinder Mario. The next section features chestnuts rolling down a slope. Near the end, Mario must drop down to the right, where there is a Pipe allowing him to reach a higher ledge with a Goomba hitting a tree to drop down chestnuts. Mario must hammer this tree to drop down Bob-omb, who starts rolling down the slope. He somehow ends up dozing off on a stump near the end of the level, allowing them to exit the valley and move on to the shrine.
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