Game: The Metal Gear Solid (1998)

After kicking soldier ass and sneaking around in boxes, super-agent Snake comes face-to-face with a bipedal, hulking mech. Just to emphasize its power, the Gear starts off with a dinosaur like roar and the fight begins. In all of its incarnations, Metal Gear Rex unleashes rockets, shock waves and a hail of machine gun fire. Yes, there is a lot of dodging and shooting involved with beating it but the win is worth it.