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 is the main threat that Mario and his friends must stop throughout 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.

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 the player onto him to face four more challenges, concluding with a final boss fight against him. 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 城クッパ[1]
Jō 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