The design objectives emphasized the dissonance of both franchises and creating a strategy game that stood out with unique elements.

Although the game was met with poor reception when it was leaked, primarily due to the use of the Rabbids' franchise and weaponry, it was well received when it was officially announced at E3 2017.

While the goal of each battle is usually to defeat every enemy on the field, some levels have a fixed objective, such as escorting a Toad to the end of the stage.

The level is completed if all enemies are defeated or the fixed objective is satisfied; the player loses when all characters run out of health or fail to meet their goal.

While the inventor is out of the room, the Rabbids arrive in their Time Washing Machine and begin to cause chaos as they play with her belongings, to Beep-0's annoyance.

[5] A vortex-like anomaly in spacetime appears above the Mushroom Kingdom during the unveiling of a statue of Princess Peach and sucks everyone into it, including Mario and his allies.

Beep-0, now a physical entity with Rabbid-like attributes and an ability to speak, discovers that the SupaMerge has become part of the Rabbid wearing it, who uncontrollably transfigures more of its brethren.

Aided by a mysterious email contact known only as F.B., who provides them with weapons, abilities and advice, the two groups join forces to put a stop to the chaos.

Resolving to recover Spawny so they can put an end to the crisis, the heroes eventually learn that the anomaly presumably created by the SupaMerge and referred to as the "Megabug" is growing more powerful as they rehabilitate more of the corrupted Rabbids.

As peace returns to the Mushroom Kingdom, the heroes celebrate their victory by replacing the statue of Princess Peach that had been destroyed when the crisis began with one of the Peach-like Rabbid.

Shortly after arriving, they defeat Rabbid Kong in a pair of final battles, the first one in his lair, which is then destroyed when the corrupted water explodes, and then again when they chase him to the coast, depriving him of his power and causing the effects of the Megabug's influence on the island to be undone.

In a post-credits scene, the inventor from the prologue returns and discovers Rabbid Peach's photos of the island, which somehow ended up in her room.

When Soliani presented thirteen ideas to Manzanares, he abandoned the focus on combining the brands and shifted attention towards the game itself.

[8] On multiple occasions, Nintendo directly asked Ubisoft to put more emphasis on the weirdness of the Rabbids; Miyamoto found the characters to be a unique source of humor unexplored in the Mario franchise.

When it came to the level of difficulty, Soliani was surprised to see nine-year-old children pulling off stunts he believed would not work with a younger audience.

[7] "It struck me... how on earth was I going to write music for Mario after Koji Kondo, who is the greatest games composer in the world?

Like Miyamoto, Soliani was a big fan of his works as he grew up with a Nintendo 64, which contained multiple games with music by him.

It simply mentioned a game he could be interested in composing music for, so he signed a non-disclosure agreement and met with Soliani in Paris, France.

[16] It was later released in Japan and other East Asian territories on 18 January 2018, where Nintendo published and distributed the title for Ubisoft.

When the concept was met with negative reception, the development team became discouraged and lost morale, which caused Soliani to emphasize a unique experience because of it.

[24] Rabbid Peach in particular emerged as a popular character with critics and players following an initially divisive reception before the game's release.

[45][46] Gabe Gurwin of Digital Trends regarded her as the standout of Kingdom Battle's cast, praising her for her humor and entertaining personality and suggesting that she should appear in the crossover video game series Super Smash Bros.[47] Paul Tamburro of Game Revolution stated that she "steals the show" in Kingdom Battles, crediting her with giving the Rabbids mascot a personality.

[48] Critics were divided over Ubisoft's decision to center the game's promotional efforts on social media around Rabbid Peach; Kotaku's Gita Jackson found the change creepy due to its attempts to personify brands, and felt that the account mocked women on Instagram.

Writer Laura Kate Dale was more positive and commented that Rabbid Peach "stole the show" in Kingdom Battle, particularly citing her love for taking selfies on her mobile phone as a contributing factor.

[34] PCMag considered this to be due to the lack of complex statistics and probability, and rather favored simplistic "coin-flip" chances.

[3] The Verge also praised its simplicity, and claimed that it blended well with the Nintendo Switch and its portable functionality due to the structured format.

Writing for Destructoid, Chris Carter found the space in between levels to be filler rather than a unique exploration feature, only used to hide collectible items.

[27] In addition, Jeff Marchiafava of Game Informer found certain collectibles, such as music and concept art, to be lackluster and not worth going out of the way to achieve, although the combat phases more than made up for it.

[1] Kingdom Battle received numerous awards, generally in strategy game categories alongside several other nominations.

[69] Rabbid Peach appears in Just Dance 2018 as the alternative playable mascot for Beyoncé's song "Naughty Girl".