Castle Bowser

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Not to be confused with Bowser's Castle.
Castle Bowser
Render of Castle Bowser from Super Mario Bros. Wonder
Applies to Bowser
Item needed Wonder Flower
First appearance Super Mario Bros. Wonder (2023)
“Ohhh ho ho ho... Isn't this fun! The Flower Castle is me, and I'm the Flower Castle! Soooo much Wonder power! I can feel myself getting stronger...and stronger...AND STRONGER. Soon, everything will be mine! Gwahahaha!
Castle Bowser, Super Mario Bros. Wonder

Castle Bowser is a form that Bowser takes on in Super Mario Bros. Wonder, and serves as the main antagonist of the game. The form is the combination of Bowser, his Koopa Clown Car, and the Flower Castle (Prince Florian's castle), created when Bowser comes into contact with a Wonder Flower in the game's opening cutscene. He has a green, round body with his face all across the front and lime green horns at the sides. Atop is an altered version of the Flower Castle with a top section resembling Bowser's head, albeit with the hair piece being significantly enlarged.

After his transformation, Castle Bowser travels across the Flower Kingdom wreaking havoc, imprisoning Poplins in their houses by turning them into fortresses, and stations in the center of the Petal Isles.

When the final Royal Seed is collected, Castle Bowser invites Mario and his friends onto him to face four more challenges, concluding with a final boss fight against him, with Bowser taking on the form of the head of the castle on top. After the game is completed, Bowser, the Koopa Clown Car and the Flower Castle are separated.


As a location, Castle Bowser contains five levels, all of which are listed as Petal Isles levels.


  • Trading card bio: With a touch of the mysterious Wonder Flower, Bowser merged with Prince Florian's castle to spread chaos across the Flower Kingdom.


Names in other languages[edit]

Language Name Meaning
Japanese しろクッパ[1]
Shiro Kuppa
Castle Bowser

Chinese (traditional) 城堡庫巴[2]
Chéngbǎo Kùbā
Castle Bowser

Dutch Kasteel-Bowser
Castle Bowser
French Fort Bowser
Fort Bowser
German Schloss-Bowser
Castle Bowser
Italian Bowser castello
Castle Bowser
Portuguese Bowser Castelo
Castle Bowser
Russian Боузер-замок
Castle Bowser

Spanish Bowser Castillo[3]
Castle Bowser