Red-Brief J is the boss of Thrillsville in Wario World. It is a large, bipedal, anthropomorphic bull, who, as his name suggests, is clad in red undergarments, as well as a metallic helmet. His body is covered in a few scorch marks.
The battle takes place on a metal platform suspended over a pool of lava, located in a snowy canyon. Red-Brief J has the largest variety of attacks of any of the bosses in the game. Before it starts any attack, it will strut around after Wario with its hooves on its hips. Wario must not go near Red-Brief J's feet when he does this, because fire erupts from them while he's walking. In his first and most common attack, it absorbs orange energy and charges toward Wario at full speed. The number of charges increase by one for each point of damage Wario delivers.
Red-Brief J's second attack is to point and shoot homing fireballs from the hooves on its arms. Meanwhile, Red-Brief J's third attack involves drawing in purple energy and jumping extremely high, then landing at the middle, briefly dunking half the arena in lava. Wario must stand on the middle area to avoid being hurt from this attack. Its fourth attack has Red-Brief J jump into the air and start spinning, while drawing in blue and white energy. It starts front-flipping and then dives head-first into Wario.
In Red-Brief J's final attack, it draws in pink energy and spins around, while homing towards Wario. Being hit by this attack stops Red-Brief J from spinning.
Red-Brief J is immune to all of Wario's direct attacks, and he will counter-attack with one of his own moves if Wario punches him. After he uses his charging attack, Red-Brief J will teeter off the edge of the platform. If Wario Ground Pounds the arena during this time, Red-Brief J will get knocked into the lava, release a huge amount of coins and lose one hit point out of five. After this, he'll return to the center of the arena and resume attacking. After losing all five hit points, Red-Brief J explodes and Wario receives the third piece of the Huge Treasure Chest Key and gains access to Sparkle Land.
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