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The level consists of a gloomy beach that Mario and Yoshi must traverse. After getting through hordes of enemies such as Cheep Cheeps, Bloopers, and Koopa Para Troopas. There are also several jump pads in which Yoshi needs to jump off of in order to cross large bodies of water. The player must be especially careful, as even one hit from an enemy can careen the duo into the nearby water.
Boss Fight: Mecha Nokonoko
Mario and Yoshi will eventually reach the end of the beach and fight the Mecha Nokonoko. The sub will fire green balls at the duo as they attack the Koopa Troopas manning the sub. After all of the Koopa Troopas are defeated, the sun will open up three more cannons that shoot green balls at the duo. The duo must attack the sub's "mouth" when it opens; after they attack the mouth enough times, the duo will receive a gem and can finally continue to Bowser's Castle.
Names in other languages
|Inlet Sea Course|
|Characters||Mario • Yoshi • Princess Peach • Prince Pine • King Fret|
|Jewelry Land locations||Light Realm||Grass Land • Mushroom Land • Pipe Island • Crescent Coast • Spirit Mountain • Grand Bridge • Float Castle I|
|Dark Realm||Cornice Cave • Ghost Mansion • Float Castle II • Dark Sea • Bowser's Castle|
|Bosses||Hammer Brother • Lemmy Koopa • Ludwig von Koopa • Boomerang Brother • Wendy O. Koopa • Tsūdebiru • Larry Koopa • Sledge Brother • Morton Koopa Jr. • Iggy Koopa (King Gessō) • Roy Koopa • Firesnake • Magikoopa • Lakitu • Big Boo • Chargin' Chuck • Mecha Nokonoko • Bowser|
|Enemies||Anvil • Blooper • Bob-omb • Big Boo • Bullet Bill • Cheep Cheep • Flying Goomba • Green Shell • Lava Bubble • Koopa Para Troopa • Koopa Troopa • Mechakoopa • Monty Mole • Nipper Plant • Para Bomb • Spiny • Spiny Egg • Tako|
|Power-ups||Power-up Mushroom • Fire Flower • Super Star|
|Miscellaneous||Gallery • Media|