Float Castle I
The level is the first of two floating castles in the game, but the only one that is seen initially on the map. Mario and Yoshi traverse paths above a massive drop. Enemies such as Bullet Bills and Lava Bubbles appear, as well as many jumps over endless drops.
Boss Fight: Roy Koopa
At the end of the level, Mario and Yoshi leap from the castle to encounter the Koopaling Roy Koopa in a hot air balloon, loaded with some cannons and armed with bombs that it periodically throws. After damaging both the cannon and the arms, six more cannons appear on the balloon, and Roy occasionally appears, giving Mario the opportunity to shoot him. After shooting the cannons and deflating the balloon Roy falls.
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