Ranking All Of Metal Gear Solid's Boss Battles From Worst To Best

6. Metal Gear REX (MGS)

Surely the most epic and challenging fight in the original MGS, Snake must take on a Liquid-piloted Metal Gear REX. With the use of chaff grenades and the Stinger launcher, the first phase of the fight isn't too difficult, but once REX's health is depleted, a cut-scene will play out with Cyborg Ninja aka Gray Fox (who attacks REX and gets crushed to death), and when gameplay resumes, REX now has a much larger health bar. REX's attacks include missiles, gunfire and an annoying laser beam that sweeps across the floor at Snake, but with some clever manoeuvering and liberal use of the Stinger, REX eventually goes down. Still, this one proves hugely infuriating because if you died in the second phase of the fight (which you almost certainly did, a lot), you had to go all the way back to the start of the entire fight, rather than things just resuming from Gray Fox's death as they probably would in a more recent MGS game. Still, a suitably difficult battle for one of the series' most formidable foes.