A Brolder and a Goomba Tower are your first opponents in this lava-filled level. Remember, you can’t touch any of the lava surrounding these platforms. If you’re playing by yourself, don’t throw that Brolder into the lava just yet!
Green Star #1
Use a Brolder to activate one P Switch panel while you hold down the other. This lowers a bridge into place for you to cross the lava and retrieve the Green Star.
Watch out for the Lava Bubbles while navigating the rotating platforms.
Green Star #2
Shortly after surviving the Clear Pipe trip through the lava, you encounter a Mystery Box. The bonus room beyond it requires you to use two Brolders to activate two of the panels in the room, while you stand on the third. Work fast; you have 10 game seconds to do it.
Stamp
On the wall opposite to the Mystery Box, you can find the Stamp. The problem is, you need the Cat Power-Up to reach it, as there’s no other handy way of scaling the wall.
Green Star #3
The final Green Star can be found over the lava next to the bridge leading away from the Stamp wall. You have no way to reach it yourself. However, Brolders will appear on the bridge, and you must throw one of them at the Green Star. With that, everything in the level has been collected. Make your way off the bridge, up the large stone steps, and into the pipe. You’re in for another boss battle!
Boss Battle: Boss Brolder
Boss Brolder is not pleased to see you, and he’s brought friends to help shove you off the platform and into the lava.
The fight begins with Boss Brolder and his minions rolling toward you. To hurt the boss, you need to pick up one of the smaller Brolders and toss it at the big guy. This is easier said than done; Boss Brolder will simply roll over any of his minions that you stun too close to him.
After you score a hit, Boss Brolder spin wildly, flinging lava rocks onto the arena. Stay away from him and the lava rocks!
Eventually, Boss Brolder winds down, and he roll a short distance around the arena. When he stops, he summons three more Brolders, and the cycle begins again. He moves faster during later cycles, which means he can crush the smaller Brolders before you even have a chance to use one against him. His spin attack lasts longer while flinging more lava rocks onto the arena. You must score three hits before Boss Brolder is defeated. After that, you have to make a final run across the roof of the castle to reach the Goal Pole. World 4 is in the bag!