In Metroid games, there is one thing that really sticks with you. No matter how great a puzzle is, it is rarely remembered over a great boss fight. Boss fights, in Metroid games, are essentially a puzzle on their own, a puzzle that can kill you. Every time you encounter a boss you need to determine its weaknesses and decide how to defeat them. There are great boss fights in each of the Metroid trilogy games but none compares to the greatness that is Quadraxis. This is a boss that actually made use of the Echo Visor in a meaningful way. The visor is used in other instances in the game, but this is one of the rare times that it actually made sense.
First of all you need to take out the four-legged spider creature by the knees. Once you get it down to the ground you tear away at its armor until the body of the system separates from the legs. The body then flies around receiving sound frequency data from the legs. Until you destroy the sound frequency signal, using the visor, the body is invulnerable. The body is too high in the air for you to reach from the ground so you must use the Morph Ball to crawl up the legs, still resting on the ground at a 45° angle, and boost ball off to attach to the floating body. From here you drop bombs in certain locations on the body. This is a boss fight that could not be done in any other game.
1) Metroid Prime 2: Echoes (Quadraxis, Morph Ball-only boss)
2) Metroid Prime (Metroid Prime, Meta Ridley)
2) Metroid Prime 3: Corruption (1st Meta Ridley, Gandrayda)
For all of you out there that may be sick of these Metroid comparisons, this is where it all ends. We've compared bosses, graphics, weapons, suits, and many other Metroid-esque features. MP is the most influential of the Metroid games, MP2 has the best boss fights and suits, and MP3 has the best graphics and controls. So how do you decide which of the three trilogy games is the best all around game. Well, what it really comes down to, is the best balance and overall impact. MP may not have had the best scan system of the three, the best weapons, or the best graphics but the trilogy would not exist without it. This is as good a transition from 2-D to 3-D as it comes and we owe it all to the greatness that Metroid Prime.
One last thing that needs to be mentioned is the character model used for Samus. In this regard, MP is far, far superior to that of MP2 and MP3. If you need to see for yourself, please see the images below. MP Samus is the image on the top and the cartoony looking Samus from MP2 and MP3 is on the bottom. Enjoy.
1) Metroid Prime (Balance and Innovation)
2) Metroid Prime 3: Corruption (Compilation of everything)
3) Metroid Prime 2: Echoes (Wonderful Bosses)