Sluggy the Unshaven

"Aaaaah, Yoshi! To get this far you must be powerful, but remember: This slug has no weak points!!"

- Kamek

Sluggy the Unshaven is a massive Sluggy found in Super Mario World 2: Yoshi's Island. He is a mid-boss encountered in the fort of World 5. He is a see-through slug with a face, hair in various places and a visible, and hairy, heart. To defeat him, the Yellow Yoshi has to throw eggs at his heart, pushing through his gelatinous skin. He was originally a tiny, nontransparent Sluggy until Kamek used his magic on him.

In Sluggy's open-air room is an Egg Plant. However, he is at the very edge of the room. Once Yoshi has collected enough eggs, the player must lob eggs at the slug's skin. Every time an egg hits the skin, he is pushed inward and the egg bounces off. Yoshi can then pick up the egg and lob it again. Once the skin is pushed back enough, Yoshi can shoot Sluggy's heart (which is the slug's weak point). After four hits, the heart shrinks until reduced to nothing, and Sluggy the Unshaven slides off the stage.

Sluggy is incapable of knocking Baby Mario off Yoshi's back, making this the only boss fight where stars cannot be lost. However, he continuously slides forward toward the edge of the room, making it necessary to defeat him before he pushes Yoshi off the stage into the pit.

Much like Prince Froggy and Naval Piranha, it is possible to see the boss before Kamek magically alters him. However, the player cannot destroy Sluggy before Kamek appears, like they can with Naval Piranha.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: Halfway through the snowbound landscape of World 5, Yoshi encounters the first boss in video-game history whose heart has a 5-o'clock shadow. Sluggy oozes with the desire to leave Yoshi out in the cold, but the dynamic dino can stay warm if he keeps his cool. Slug Sluggy by pitching eggs at the bewhiskered one's heart, but be warned: Kamek's magic potion quickly fixes dents in Sluggy's slimy skin!
 * Super Power Club Cards bio:
 * Description: Big and blubbery. Hides out in his fort. Likes to slime dinos and baby plumbers.
 * Favorite Movie: 
 * How to Beat Him: Make sure you have a full supply of eggs before grappling with this gelatinous giant! Shoot enough eggs to rip open a hole to Sluggy's pink heart.
 * Shogakukan guide: 透けて見える八一卜型の心臓が急所. ふにょふにょしてて手ごたえがないせいか、どうも翮争心がわかない. (The translucent eight-eighths-shaped heart is the most vital point. It is very soft and not very firm, so it is hard to feel the struggle.)

Yoshi's Island: Super Mario Advance 3
(The boss of World 5-4 is covered with a soft body. Throw an egg at it to dent its body, and damage its visible heart four times.)
 * Shogakukan guide: ワールド5-4のボスで、やわらかい体におおわれている. タマゴを投げて体をへこませ、透けて見えるハ一卜に4回ダメージをあたえよう.

Trivia

 * Hacking methods show that if enemies are shot into Sluggy the Unshaven, they become glitched sprites.
 * A preview for Super Mario World 2: Yoshi's Island refers to Sluggy the Unshaven as "Giant Watabo", although the previous page refers to Fuzzies as Watabos. Incidentally, an early version of Sluggies resemble Fuzzies.
 * According to the Player's Guides, Sluggy the Unshaven does not actually mean any harm.