Spend the indicated type of credits to unlock the corresponding bonus song.

Beat the game and you will get Hyper Mode Difficulty

Spend the indicated type of credits to unlock the corresponding bonus content.

Spend the indicated type of credits to unlock the corresponding concept art.

Beat the game and you will get Hyper Mode Difficulty

Collect at least 75% or more of suit upgrades to view an extended ending once you complete the game.

Collect all 100 pickups to view a secret ending clip after the game credits.

If you complete the game with 75% pickups or more you will get an extended ending.

If you complete the game fully with 100% pickups you will get an extension to that ending.

If you complete hypermode difficulty with 100% pickups you get a complete ending in wihich is brilliant ^^.

Kill all the Space Pirates except for one. When the sucking beam enters the room, kill the Space Pirate and it will get sucked into the beam. Then, look up. There will be four panels. Shoot one until it explodes. Repeat this until you have shot all four.

Select your X-ray visor, then lock onto a Space Pirate Commando. A small screen will appear showing an "up close" of the Commando. You should now be able to see a small red spot where its face should be. If you can manage to shoot this spot, he will die instantly. Two to five rapid fire shots usually hits it.

Use the following trick when you encounter a Pirate Berserker (which happens often). This huge creature has two red lights on its shoulders. While dodging its shots and "waves of pain", destroy these lights using your beam and missiles. When they are both destroyed, wait for it to shoot purple orbs. Dodge the red ones, as they will hurt you. Shoot the purple orbs and they will fly back at him. After doing this about three times, a red light should pop up on his head. Go into hyper mode and blast way at it. This should not take too long. Then, collect the health and continue on your journey.

Whatever you do, do not get hit. Besides that, just shoot him in the mouth whenever you get the chance. When he is stunned, rip open his chest with your Grapple Beam, go into Hyper mode, and blast away. Repeat this until he gets armor over his chest. When he is stunned, go into your X-Ray visor and shoot his shoulders. You will then be able to shoot his chest. Use your Hyper mode and kill him.

When in your ship at the beginning of the game you will eventually be asked to input your security clearance on a console. Afterwards, activate the console again and input the same sequence: the character second from the right, the "X" like one that is second from the left, then the three dots above a line fourth from the right, then the pyramid made of three line on the far left. You will hear a message in Japanese from Satoru Iwata, the president of Nintendo. The translation is "Hello, this is Iwata from Nintendo. A president has to take things really seriously, even if it doesn't seem like it. It's understandable if you lose weight from stress... but I get fatter instead. Nobody thinks I'm taking it seriously."

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the eighth symbol, the third symbol, the fifth symbol and then the fourth symbol.
You will then hear a message from Mr. Miyamoto!

A rough translation:
Ah, can you hear me? This is Miyamoto.
All of you playing Metroid, can you hear me?
Its fun, isnt it?
Ive also worked on many [Metroid] games, but this one is the best yet, dont you think?
Definitely play it all the way to the end.
See you!

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the third symbol, the sixth symbol, the fourth symbol and then the eighth symbol.
You will then hear a message from Mr. Yamoto!

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the first symbol, the third symbol, the eighth symbol and then the fifth symbol. You will then hear a message from Mr. Tanabe!

Simply switch to x-ray visor and lock on to the red dot in the middle of the body. requires nova beam.

Choose the x-ray visor and you will see three glowing dots that are connected. Simply lock on and shoot it with nova beam, and it should instantly explode.

When you are on phaaz there will be a yello bar on the top of the screen. If it fills you will die. An easy way to keep it from filling up is to use the graple beam on the phasings. Then press the analog stick up to releas some of the phason energy but they explode after 2 seconds. Keep repeating this and fighting Dark Samus Should be a breeze.

In Skytown, go to the place where you acquired the first part of the bomb for your ship. There is some Phazite near the bottom, shoot the switch inside to activate the satelite system.

Get to the top and around the walls using the Spiderball Tracks and bomb all the bomb slots to get markers on your map to reveal the locations of every expansion (missle,ship missle,and E tanks) in the game, except the items that are in the Valhalla

When in Samus' ship, go to the radio And press the following symbols.
Going from left to right, press the second symbol, the seventh symbol, the fifth symbol and then the first symbol.
You'll be greeted by Iwata himself. Of course, this is in Japanese.

A brief translation...
Hello, this is Iwata from Nintendo.
A president has to take things really seriously, even if it doesn't seem like it. It's understandable if you lose weight from stress...but I get fatter instead. Nobody thinks I'm taking it seriously.

There is a reference to Planet Zebes (the planet that Samus visited during the original Metroid and Super Metroid) that can be found on the Pirate Homeworld. Land your ship at the Research Facility and find the place on the map called Metroid Processing. Once in this room you will find an empty tank next to the Spider Ball rail. Scan the tank to get the following message: "Data decoded. Zebes specimen. Highly aggressive subject has been transferred to an off-site laboratory."

Having these games on your Wii system memory will cause your ship to get decals when you enable the bumper sticker bonus:

Wii Play
Wii Sports
Zelda: Twilight Princess
Super Paper Mario
Metroid Prime 3
Excite Truck
Wario Ware: Smooth Moves
Mario Party 8