Metroid: 25 Greatest Boss Fights RANKED
11. Boost Guardian - Metroid Prime 2: Echoes
Metroid Prime 2: Echoes begins with a group of aliens called The Ing stealing Samus's weapons. Throughout the game, you need to defeat bosses to reobtain your powers. As difficult as these enemies are, nobody tests Samus more than the Boost Guardian. This dark monster is so tough, the game's director never defeated him!
Throughout the battle, he rolls into a Morph Ball and boosts around the room, trying to collide into you. He moves at ferocious speed, making it hard to gauge the best way to avoid his path or to hit him.
Sadly, this is an enemy you can't defeat by just blasting relentlessly because there are periods where he is only vulnerable to Bombs. Since you can only drop three Bombs at a time, you need to be patient and precise when striking this guardian.