Salvo the Slime's Castle
Salvo the Slime's Castle is the eighth and last required level to access World Two in the game Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. This is the first level in which the player gets to control Blue Yoshi. It also introduces Lemon Drops, Spray Fish, and Bandits (as enemies). It also features several never-seen-before challenges, such as Spiked Platforms that can be turned around.
As the level starts, the first thing the player notices is a new obstacle that looks like a spinning, slopped platform. Yoshi has to jump on it and grab the coins above, and presents little trouble. Next is a familiar spinning wheel of platforms. Only the left-most coins are red, although collecting the two remaining ones should be no problem. Forward is another slope, except this time falling means losing a life. The player should grab the coins floating above and continue to some self-spinning purple platforms, avoiding the Podoboos and the lava. Next is yet another slope, this time with lots of coins floating. Yoshi must try to grab the coins and jump to the wooden platform to the left to obtain a Special Flower and a single red coin. After that, the player must just access the Pipe.
This new room is certainly different to the player. There is a strange, water-controlled platform, a Spray Fish and a lake with a waterfall in the background. The player, must before anything, jump on the platform (avoiding the fish's water) and grab the first, easy-to-find Special Flower. After that, the player must hop on the platform again and this time Flutter Jump to the right to access a new pipe and find yet another Special Flower. Finally, and to finish off with the room, the player must flutter jump to the right to find two red coins, a Middle Ring and a ? Cloud containing five stars. If the player does not have eggs, he or she needs to go back to the room with the fish and enter the right-most pipe for some purple Shy Guys. Upon collecting everything and skipping the Shy Guy room, the player has to enter the Pipe for a new area.
In this part, Flipping Platforms and Bandits are introduced to the game. First of all, the player must hit the Help Block for some information and immediately throw an egg at the green block to the right for Green Spiked Platforms to flip. Yoshi must ignore the flipped green platforms and go all the way to the right for a Special Flower. There's also a Bandit here, the player must either ignore it or jump on it a few times for some coins. Now the player needs to go back to where he or she found the green block and jump on the Spiked Platform. Next, he or she has to have Yoshi jump to the right and throw an egg at the ? Cloud for some stars. After that, the player must go back to the green platform and jump to the other way (up) until he or she finds a Spinning Platform Wheel. Yoshi must hop on one of the platforms and follow the way until he or she finds a Red Block, which must be hit with an egg for Red Spiked Platforms to flip. After this, the player must return to the first Green Spiked Platform and jump to the right to the now safe Red Spiked Platform and collect the coins. Above there is a Spinning Platform Wheel. Yoshi needs to jump on any of the platforms and wait for the wheel to take him to the some wooden platforms. Obviously, Yoshi has to jump on these platforms, push the Flower Pot and collect the key that falls. Now with the key, Yoshi has to just jump up, trespassing the wooden platforms and head to the right. If he continues all the way to the right without going down, he or she obtains the last Special Flower of the level. Then the player must go back a little, get some eggs by hitting the Egg Block and hop on the Red Spiked Platforms for the last red coins; continue the way and enter the door.
In the new room, the player can notice a Yoshi-sized rotating sphere with an arrow drawing on it. Yoshi must hop on it for the sphere to take Yoshi to the direction the arrow is pointing at. If Yoshi wishes to change direction, or he must do is jump, as while Yoshi is not standing on the sphere, it keeps rotating. While none of the coins in this room are red coins, the player may obtain them anyway. Next, he or she must, before going through the red door at the top, make a stop below where the door is to make contact with a Middle Ring in case Yoshi is in need of extra stars. Once that's done, the player must access the Red Door and face the new boss.
 BOSS: Salvo the Slime
Similar to Burt the Bashful, Salvo the Slime is a gargantuan Lemon Drop transformed by Kamek's magic. As Yoshi steps into the room, Lemon Drop drops down from the ceiling, and Kamek quickly appears in the room and yells: "Hi there, cute li'l Yoshi! Does Baby Mario want to go to Bowser's Castle? I'll take him there in a hurry! Tee hee hee..." And just like in Burt's battle, Kamek will fly around and transform the Lemon Drop into Salvo the Slime.
To defeat Salvo Yoshi must throw eggs at him which makes him gradually decrease in size by losing small Lemon Drops from his body. Yoshi can either eat or throw an egg at the Lemon Drops for them to be defeated. In order for Yoshi to get more eggs, he must eat the Lemon Drops left behind by Salvo. As Salvo gets smaller and smaller, he becomes faster and bounce higher, until finally becoming so small he implodes. After that, Salvo leaves a key behind, used to access World Two.
Oddly, Salvo can't hurt Yoshi, while the Lemon Drops can. Also, Salvo tries to push Yoshi into a pit that has lava below it.
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