After smashing through a submarine, Sparkster ends up in an Egyptian desert. A majority of this stage takes place inside a pyramid, where passing special doors will shift the inside of the pyramid.
You can get lost in here. There's even a room that reverses both your movement controls and your action controls. You'll know when you see me stuck in the room for a few seconds.
Getting through that maze has you fight a midboss. Just keep attacking its head while dodging its arms until it's completely finished.
This is a good stage to take an advantage of roll canceling during a rocket attack. It'll make going through certain areas faster and easier.
The boss is a Desert Worm. You can attack its many segments and make them red, but you have to kill by striking its head a lot, too.