Metroid Fusion, released in 2002 for the Game Boy Advance, is officially Metroid 4 in the series timeline. After being infected by the mysterious X Parasite, Samus Aran undergoes a life-saving procedure that fuses her DNA with that of the Metroid, her once-deadliest enemy. The result? A new suit, new abilities—and a new threat: SA-X, a terrifying, mindless clone of her former self. Metroid Fusion is a more linear take on the Metroidvania formula but makes up for it with tense storytelling, fluid combat, and relentless atmosphere. What makes it legendary: 👁️🗨️ Creeping horror vibes as SA-X hunts you through the space station 🔁 Metroid DNA meets new mechanics, like ledge grabs and navigation hints 🧬 Suit upgrades like Diffusion Missiles and Power Bombs 🔊 Incredible sound design and unsettling music for a handheld game 🎮 Fast-paced combat and smart boss design 📖 One of the most story-driven Metroids, with actual dialogue and cutscenes 🌌 Compact but dense world, built for handheld perfection This isn’t just a good Metroid game—it’s Metroid horror. It’s Samus alone, vulnerable, and being hunted by something stronger than her. For many, Fusion is the most intense Metroid game ever made.