The Screw Attack is the ultimate offensive and defensive power-up. When active, Samus becomes invulnerable and damages any enemy she touches while spinning in a jump. It also destroys certain blocks.
Location: The Screw Attack is usually found in a well-hidden chamber within the lava caves, often requiring the Space Jump and careful exploration to reach. Once acquired, simply jump and hold the A button to activate the spinning attack. This makes navigating through enemy-infested areas much easier and is crucial for the final battles.