Donkey Kong Adventure

Donkey Kong Adventure is a story expansion for Mario + Rabbids Kingdom Battle, included in Mario + Rabbids Kingdom Battle Gold Edition and available as add-on content that can be purchased from Nintendo eShop for other versions of the game. As its name suggests, it prominently features Donkey Kong. The expansion becomes available when the Top Banana level of the base game has been completed. The expansion follows Donkey Kong, Rabbid Peach, Beep-0, and Rabbid Cranky as they work to defeat Rabbid Kong, who seeks revenge for his defeat in the main game, and has formed an army. It features exclusive enemies, weapons, collectibles, and worlds not available in the main game. Donkey Kong and Rabbid Cranky are also exclusively playable in Donkey Kong Adventure.

Story
The story begins just after the defeat of Rabbid Kong in Ancient Gardens. Bowser Jr. and Spawny are seen spying on Peach's Castle, though they also see Rabbid Kong near the Time Washing Machine. He later touches it after being encouraged by some Rabbids, but he gets electrocuted and causes it to malfunction. Rabbid Kong, as well as some various junk and Rabbids, are sucked into the machine, which stresses Spawny out, causing him to fire a ray from the SupaMerge headset into the machine. Bowser Jr. and Spawny escape just as Mario, Luigi, Rabbid Peach, and Rabbid Luigi arrive. Rabbid Peach later goes over to the machine to plug in her cell phone, but she gets sucked into the machine alongside Beep-0, who was trying to get her away from the machine.

In an alternate dimension, the Time Washing Machine falls onto an unknown island. During the fall, Rabbid Peach and Beep-0 fly off and land at a small area of Banana Lagoon. There, the two wake up to find themselves on the unknown island. They attempt to talk to some locals, who turn out to be Tropical Ziggies who attack them. Rabbid Peach left her Blasters back at Peach's Castle to roast mushrooms, so she cannot fight back. Suddenly, Donkey Kong appears, causing the Ziggies to flee. Alongside him is Rabbid Cranky, an elderly and grouchy Rabbid dressed as Cranky Kong. The three defeat the Ziggies after Rabbid Cranky gives Rabbid Peach a new Blaster.

While exploring, they come across parts of the Time Washing Machine, only for them to be taken by Collectors. They also face Smugglers that carry some Bad Bananas. After collecting a few parts, Rabbid Cranky leads the team to Rabbid Kong, who notices Rabbid Peach and remembers their battle in the main game, enraging him and causing him to punch her into the ground. This also angers Donkey Kong and Rabbid Cranky, who then proceed to attack him. Rabbid Kong then commands a bunch of enemies to attack them, and after Rabbid Peach comes back out of the ground, the trio proceed to fight Rabbid Kong's minions.

After that, Rabbid Cranky tells them how the main part of the Time Washing Machine ended up at Rabbid Kong's fort and powered him up. The gang then head off to find the two keys to reach his hideout. They also learn that the Time Washing Machine was being used to create Bad Bananas, which can power up Rabbids and are the source of Rabbid Kong's new powers. Each one of the keys is located at a different path, with one of the paths leading to a broken bridge to the Reef. They then battle a big Rabbid with a key known as Side Eye, who is tricked into fighting them. After defeating Side Eye, it is revealed that he is one of the Rabbids that were with Rabbid Kong at the start of the story.

After obtaining the first key, they free some Rabbids from the Megabug's control, and they fix the bridge to the Reef. They soon came across Finn, another big Rabbid who owns the second key. After defeating him, it is revealed that Finn was the other Rabbid who was with Rabbid Kong at the start of the story.

After obtaining the second key, they unlock the gate and storm into the Jungle, and Rabbid Kong, who was spying on them, throws coconuts at them throughout the level. They soon encounter Mega Rabbid Kong and fight him. After destroying the Megabug Pool, Rabbid Kong escapes as it explodes and the team falls into the Dungeon. The trio escape from the Dungeon, only with Rabbid Kong waiting for them for one last battle. The three use a golden Blast Barrel to destroy his hammer, and he spits out his Bad Banana. Rabbid Peach then convinces him to bring the main part of the Time Washing Machine back to Banana Lagoon to send her and Beep-0 back to Peach's Castle. At the end of the game, the team hugs a sad Rabbid Kong, which makes him happy again.

Heroes
In Donkey Kong Adventure, only Rabbid Peach, Donkey Kong, and Rabbid Cranky are playable. While Rabbid Peach is only slightly altered from her main game version, Donkey Kong uses almost all new abilities and Rabbid Cranky combines and renames existing abilities.

References to other games

 * Donkey Kong: An area features a Rabbid on a girder throwing barrels at another Rabbid jumping over them, much like Donkey Kong and Mario do in this game, respectively. Beep-0 comments that the jumping Rabbid would "be lucky to get to 125 meters unless he finds a hammer".
 * Donkey Kong 64: An arrangement of the hub world music from this game appears.
 * Donkey Kong Country Returns: Just before the heroes fight Rabbid Kong for the first time, Donkey Kong attacks him like he attacks bosses at the end of boss battles from this game.