Metroid: 25 Greatest Boss Fights RANKED
8. Spider Guardian - Metroid Prime 2: Echoes
Even though the first Metroid Prime is considered the best entry in the trilogy, the second one was praised for having more inventive bosses. Case in point - the Spider Guardian. Even though this bug is literally the smallest boss in the franchise, this encounter is extremely creative (and nightmarishly difficult).
Because the entire fight takes place on a Spider Rail, Samus must stay in her Morph Ball for the entire period. While the Spider Guardian travels around a labyrinth, you need to find the correct path to activate a Bomb Slot. Once done, this will cause the labyrinth to shift around, forcing the insidious arachnid into an electric coil, shocking him.
Now, no one is going to pretend this scrap isn't tough. It's so hard, the Spider Guardian's difficulty was toned down the Echoes was rereleased. Nevertheless, you have to commend the developers for creating this boss since it's one of the few that focuses on Bomb Blasts, Bomb jumps, and maze-running rather than shooting it generically.