Stage three is slightly more challenging than the previous two, but it's still not too bad. The main gimmick of this stage are the platforms which adjust when you stand on them. When one side moves up, the other goes down, and vice versa.

BOSS: Metonger Z
This boss is just plain silly. Just when you think Mets couldn't get any more ridiculous. There's nothing special about this boss, the Blizzard Attack is his weakness but charged Mega Buster shots work as well.

The fourth and final stage of Mr. X's Castle is evil with a capital E. There are birds everywhere and they have one job: to interfere with your jumps and send you plummeting to your doom.

BOSS: Mr. X
Mr. X is inside...a giant wrecking ball?? That's a new one on me. He'll sway back and forth dropping projectiles in the process. All you need to do is stand in the corner and hit him with the Flame Blast.

Timestamps:
0:13 - Stage 3
5:18 - Metonger Z
6:20 - Stage 4
12:00 - Mr. X