Ancient Gardens is the first world in Mario + Rabbids Kingdom Battle. It is a grassland and jungle area located to the east of Sherbet Desert, consisting of many flowers, water streams, immobilized Goombas, and a towering block structure.
Mario and co. first land in Ancient Gardens just after the SupaMerge headset merges with Spawny. They venture through the grassland area and get past the Sunflower before they reach Peach's Castle. After briefly reconciling with Princess Peach, Mario and co. take a cannon to enter the jungle area of Ancient Gardens, where they find and defeat Pirabbid Plant and recruit Luigi. As Mario and co. exit the jungle area and enter the base of the block tower, they encounter Toad, who warns them of an enemy on the tower. Mario and co. manage to make it to the top of the tower, where they encouter Bowser Jr., who takes Spawny and uses him to create Rabbid Kong. After defeating Rabbid Kong, Beep-0 reports that Bowser Jr. had fled to Sherbet Desert, thus revealing their next destination.
The heroes follow a linear path through the Ancient Gardens as they approach Rabbid Kong's tower. After defeating Rabbid Kong, the player can re-enter the Ancient Gardens from five different starting points. The path that the heroes follow is described below from each starting point onward.
The first starting point is located in Goomba Grove, a grassland area. The heroes start out on a wide strip of land with cubical trees, Goombas stuck in honey and flocks of little birds. The area contains two small battlefields and is followed by a long grassy footpath that weaves between trees, colored pipes and flowers.
The second starting point is in Pollen Plains, a broad park containing orange bubbly trees and toy blocks. The area can be explored for secrets, but the heroes can simply follow a snaking path through it, leading them to a water basin with bridges, wooden piers and cannons. A giant garden hose rests in the water in this area, though it serves no gameplay purpose. Beyond the piers, there are a series of snaking bridges which lead onto some plains with battlefields. Past a meandering walkway and another battlefield surrounded by Goomba Geysers, there is a long wooden bridge that rises over a palm tree canopy, leading onto an elevated thicket that hosts a battlefield.
The third starting point is in Flushy Forest, a highland with rich palm tree vegetation. Recurring elements in this area are Piranha Plants with lamp-like fixtures, which lie on the sidetrack in dimly lit parts of the forest.
The area begins with a long rope bridge that crosses over a chasm, passing by a gigantic mossy toilet with a rubber duck floating inside it. At the end of the bridge, the heroes enter a labyrinth called The Mystic Maze of Mysticism and Mazing, which contains hidden stone walls that rise from the ground as they are approached. The heroes must find a path with no walls that obstruct their progress in order to escape the labyrinth. A short while afterwards, the heroes enter a battlefield in another forested area. Past a few more bridges and some giant leaves that obscure the path is another battlefield where Pirabbid Plant is fought in World 1-4. Once the heroes beat the midboss, they can continue on to the Bamboo Islands.
The fourth starting point is in Bamboo Islands, a wetland region. The beginning of the area is a long bridge that weaves between bamboos, water lilies and reed. The bridge leads to a series of islands that are connected via wooden footbridges. These islands contain toy block enclosures with coins and chests, and can only be accessed by activating different switches throughout the area.
Past the wetland, there is a series of grassy plateaus with two battlefields, after which there is a foamy lake with several piers built above it. On the piers, there are some switches that can be toggled to adjust the position of some footbridges and a Cannon that help the heroes advance to the next area. A bridge then cuts between two large waterfalls and over a river stream and leads into a small forested area preceding the Sunset Bridge.
The fifth starting point is located at one end of Sunset Bridge, a massive paved structure that leads to Rabbid Kong's tower. The bridge has large gaps in it which can be overcome by blasting from cannons. There are two battlefields in this area, and from the second battlefield on there is a short pipe that leads to the base of the tower.
The tower is a stack of massive toy blocks sustained by a large Smasher statue. The heroes can use pipes to climb the tower and explore the grassy terraces that stick out of it. The first two battlefields on the tower are each followed by a puzzle where the heroes need to use switches in order to connect a pipe that leads them further up. In the first puzzle, activating a switch of a certain color causes the block of the same color to move gradually from side to side, bringing the part of the pipe that is adjoined to it in a certain position. The second puzzle contains a column of disc-shaped blocks that rotate around when their switches are flicked, moving the affixed pipes along with them. These are followed by the tower's rooftop, where the battle against Rabbid Kong takes place.
The waters surrounding the Sunset Bridge and the tower are dotted with DK Barrels that float on the surface. The player can find giant bananas and banana peels lying around the base of the tower, marking Rabbid Kong's presence. As the heroes approach the top of the tower, building blocks can be seen falling.
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