In the Bowser Jr.'s Journey mode, Bowser is fought in the level Bowser and...Bowser? as the captain in the last two rounds. He is first fought as a Ranged type with his Special Skill being Piercing Projectile. In the following round, he is fought as a Melee type with his Special Skill being Spin to Win. After completing the level, Bowser in his Melee form is recruited as an ally. A dark version of Bowser under the effects of Malatone Formula:X is also fought as the final boss in Beat the Minions!. His troops are dark Koopalings (also Malatone-infected), and is a Melee type. In " Duh Stoopid Bomb!," Bowser, along with several minions and an incognito Toad, attend a meeting in which a Shy Guy presents the Stupid Bomb, a device that releases a gas that makes anyone inhaling it stupid for several hours. A Snifit later tells him that Mario and Luigi set off a Stupid Bomb they took on themselves; Bowser is first displeased by this, but then is happy, explaining that they will probably set off more bombs on the rest of the population. He then presents a Smart Bomb, a bomb that will not only reverse the Stupid Bomb, but make the one who inhales its gas highly intelligent. The Snifit takes the bomb, and it explodes in his hands. Using his newfound intelligence, the Snifit usurps Bowser of his power and dumps him into Fryguy Kindergarten, where he is crowned by a group of over-excited Fryguys. Bowser reprises his role as a playable character in Mario Tennis: Power Tour. He is only playable in Exhibition Mode. The short comic " The Legend" explains how Bowser originally kidnapped the princess, and how the Mario brothers went on their quest to rescue her. When Mario reaches Bowser's castle, he notices the Koopa King outside, putting the final touches on his fortress. He panics when he notices Mario, but regains his senses and decides to battle him. However, once he is beaten, Bowser is forced to watch as his fortress is destroyed. He is depressed at the sight of his building falling apart, but is then angered at Mario, and vows revenge.

On the board Bowser's Gnarly Party, Bowser is located at a certain point on the board that changes when a Star is collected, waiting for a player to pass by him and do various things to them depending on their current size. If the player is normal size, Bowser breathes fire, causing the player to lose half their coins. If the player is miniature size, Bowser uses his fire to send them to a different starting point. If the player is mega-sized, Bowser challenges them to a game of Bowser Wrestling or Panels of Doom; winning causes Bowser to leave until the next Star is claimed, and losing causes Bowser to take half the player's coins. He also occasionally miniaturizes everyone for one turn. Bowser is later seen after Mario escapes Dreamy Mount Pajamaja, arriving while riding Antasma to show off his fully-charged Dream Stone. Bowser is not seen until after the Bros. rush to Pi'illo Castle, where he and Antasma wish for an impenetrable castle, which causes the creation of Neo Bowser Castle. You could have burned us alive, you hot-headed lout!! You don't just wake up and breath fire at the ones who watched over you when you were found unconscious outside! Do you even think-" Bowser is also given a role in the three Bowser minigames, which take place on a purple, mountainous statue of his head. In Cage-in Cookin', Bowser roasts any players that fail to escape their cage in time. In Rain of Fire, Bowser uses his fire breath to activate the cannon that shoots debris down on the field. Finally, in Scaldin' Cauldron, after all the players jump into one of the three cauldrons, Bowser enters the room and breathes fire upon two of them; players inside the cauldrons he burns lose. Yang barely contained her giggling when she got a good look at the Koopa King's pajamas. They were once a bright red, but were now stained with dirt and grass. Bowser grumbled to himself, something about a bird and wormholes. It sounded familiar to Yang, but she didn't know where.In the NES version, Bowser's fight is similar to a fight with a Koopaling in Super Mario Bros 3, in that jumping on him causes him to retract into his shell (barring his head). After he is hit enough times, he flees, and Mario rescues Yoshi. He can be seen crying during the credits. Bowser is a playable character in Mario Superstar Baseball and its sequel, Mario Super Sluggers. He is a team captain with high power stats.

It is revealed through the letters found after each world that Peach tries to escape, but Bowser's forces eventually overpower her. Bowser then holds her in a cage and keeps her next to his throne. At Bowser's Castle, Mario faces the actual Bowser, though in the same manner as the Tail Bowsers. However, Bowser had planned ahead; he set up a wooden cutout of Peach on the top of a tower. After Mario discovers this, Bowser appears from above, holding the real Princess Peach, and heads to his second castle. At Bowser Lab, Bowser allows the player to select one of the two monsters he created and duel it. Choosing the scary monster challenges Naval Piranha to the game Koopa Kurl; choosing the very scary monster only releases Huffin Puffin, embarrassing Bowser and forcing the player to leave. Once the Piranha is defeated, the minigame is the prize won.Mario cannot jump on Bowser when battling him without getting hurt due to his horns and spikes like he can in the other RPGs. However, this property is removed when Bowser becomes playable, making him susceptible to damage from above. The theme that can be heard during the boss fights with Bowser is notable for being a cover of both the Super Mario Bros. 3 Dark World map music and his boss theme from the first two fights with him in Super Mario 64. When Piccolo is the active Pixl, Bowser's jump sound effect, as with the other characters, is the same as the Mario jump sound effect from Super Mario Bros., and his fire breath sound effect is the one from Super Mario Bros. as well. His theme heard whenever Piccolo's ability is activated is a metal song. Father of Name Withheld ( Super Mario Maker 2, as evidenced by the adversity against Mario and speech manner present in his Story Mode level descriptions; "Name Withheld" refers to Bowser Jr.)