includes a new single-player mode dubbed Arcade Mode (Japanese: アーケード Arcade), a type of mini-campaign based upon the Classic Mode of Super Smash Bros. Ultimate. The mode sees the player having to complete ten battles against specific opponents, with a Bonus Stage replacing the sixth stage and a boss fight against Master Hand (who, on higher difficulties, is joined by Crazy Hand and later out-right replaced by the Orchid Palms) to conclude the mode. Unlike the All-Star Gauntlet, the player is healed in-between each match. As previously stated, like Super Smash Bros. Ultimate, each fighter has their Arcade Mode stages tailored to them, with the mode being based around the character, their franchise, or their role in such. The first-time completion of a character's Arcade Mode campaign is followed by a "Challenger Approaching!" fight with a specific character that, should they be beaten, will unlock them for use in the game; subsequent completions will have the player instead challenge a random fighter that they had previously lost against and thus failed to unlock.
There are two types of Bonus Stages in the game, and both take advantage of the larger platforming-based area used in the Smash Run mode: Race to the Finish and Break the Targets. In Race to the Finish, the player must locate an exit on the map while being attacked by a large number of enemies, while in Break the Targets the player instead has to locate and destroy ten targets while also trying not to be KO'd. Bonus Stages have elements of randomization unlike a character's other Arcade Mode stages, with the player's starting point and the location of their objective(s) being randomly determined each game. Additionally, it is also random which Bonus Stage the player will compete in, as that, too, is not a fixed part of the character's campaign. For a list of all of the enemies that can spawn in the Bonus Stages, see here.
This page details every fighter's pre-determined Arcade Mode mini-campaign. The game mode can be played with two players, and while the first player's choice of character will determine which set of pre-determined battles must be completed, some stages are altered to accommodate the addition of a second player.