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Detailed walkthroughs for every boss in Metroid Fusion, including Arachnus, Zazabi, Serris, B.O.X., Varia Core-X, Yakuza, Nettori, and Nightmare.

Walkthrough:

1. Arachnus

   A Core-X has taken the DNA of an Arachnus and is rampaging in the Main Deck. Arachnus-X attacks with blue energy waves, fire spread along the floor, and by rolling into a ball to ram walls. Hang from ledges to dodge the fire. Be careful, as rolling into a wall can knock you off. Shoot Arachnus-X with Beams or Missiles. After it's defeated, its Core-X form can be taken down with three Missiles.

2. Zazabi

   A creature of unknown origin, copied by a Core-X. This transparent-skinned, single-eyed, tower-shaped creature jumps to stomp Samus and tries to swallow her. If swallowed, Bomb yourself out. Shoot Missiles up through its opening to hit its eye. As Zazabi takes damage, it shrinks until killed. The Core-X inside takes four Missiles to break its barrier.

3. Serris

   An eel found in Sector 4 that swims at extremely high speeds, encased in energy and invulnerable. When not speeding, shoot Missiles at its head. Stay on platforms above the water and grab handlebars when Serris heads towards you. The Core-X inside takes five Missiles.

4. B.O.X.

   A security robot created by B.S.L. scientists. It deploys fire bombs that spread fire towers. Samus first encounters it in Sector 3 after getting the Super Missile upgrade. B.O.X.'s weakness is its tan-painted center, attacked from above. After enough damage, it staggers away and blasts through the ceiling.

   Later, in Sector 6, B.O.X. is in a semi-flooded room. Its damaged circuitry is electrified by the water. Use a Power Bomb to reveal ceiling handlebars, allowing you to hit its weak spot with Missiles. B.O.X. uses its body as a weapon and fires homing rockets. After enough damage, the robot body is destroyed, revealing a Hard Core-X. Five or six Missiles to its eye when open will defeat it.

5. Varia Core-X

   A Core-X that absorbed the Varia Suit data, mutating and growing. It is surrounded by smaller, protective versions of itself and attacks by ramming. It is invulnerable to Missiles; use Charge Beam attacks. The protective orbs can be permanently destroyed. Once enough damage is dealt, it reverts to normal, vulnerable to six Missiles to break its barrier.

6. Yakuza

   A spider boss faced at the Reactor Core in the Main Deck. It breathes fire, crawls, and can grab Samus, causing damage and ramming her. Damage Yakuza by Missiling its mouth when it opens for its fire-breathing attack. After enough damage, its head explodes, and it