Secret Message from Iwata
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.
Hyper Mode Difficulty
Beat the game and you will get Hyper Mode Difficulty.
Music
Spend the indicated type of credits to unlock the corresponding bonus song:
Battle Theme (GF): 2 Blue credits, 1 Gold credit, 4 Red credits
Battle Theme (Metroid): 2 Blue credits, 1 Gold credit, 4 Red credits
Gandrayda: 2 Blue credits, 1 Gold credit, 4 Red credits
Gryyo: 2 Blue credits, 1 Gold credit, 4 Red credits
Gryyo (Thorn Jungle): 2 Blue credits, 1 Gold credit, 4 Red credits
Helios: 2 Blue credits, 1 Gold credit, 4 Red credits
In the Cockpit: 2 Blue credits, 1 Gold credit, 4 Red credits
Omega Ridley: 2 Blue credits, 1 Gold credit, 4 Red credits
Phaaze: 2 Blue credits, 1 Gold credit, 4 Red credits
Pirate Homeworld: 2 Blue credits, 1 Gold credit, 4 Red credits
Skytown: 2 Blue credits, 1 Gold credit, 4 Red credits
Steamlord: 2 Blue credits, 1 Gold credit, 4 Red credits
The Corruption: 2 Blue credits, 1 Gold credit, 4 Red credits
Title Screen: 2 Blue credits, 1 Gold credit, 4 Red credits
Valhalla: 2 Blue credits, 1 Gold credit, 4 Red credits
Concept art
Spend the indicated type of credits to unlock the corresponding concept art:
Creatures 1: 1 Blue credit, 1 Gold credit, 3 Red credits
Creatures 2: 2 Blue credits, 1 Friend credit, 2 Gold credits, 3 Red credits
Samus: 2 Blue credits, 1 Gold credit, 3 Red credits
Storyboards 1: 2 Blue credits, 1 Gold credit, 3 Red credits
Storyboards 2: 2 Blue credits, 1 Friend credit, 2 Gold credits, 3 Red credits
World 1: 1 Blue credit, 1 Gold credit, 3 Red credits
World 2: 2 Blue credits, 1 Friend credit, 2 Gold credits, 3 Red credits
Bonus content
Spend the indicated type of credits to unlock the corresponding bonus content:
Bumper Stickers: 1 Blue credit, 2 Friend credits, 3 Gold credits, 3 Red credits
Diorama 1: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Diorama 2: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Diorama 3: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Diorama 4: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Diorama 5: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Diorama 6: 1 Blue credit, 1 Friend credit, 3 Gold credits, 3 Red credits
Mii Bobblehead: 1 Blue credit, 2 Friend credits, 3 Gold credits, 3 Red credits
Screenshot Taker: 1 Blue credit, 2 Friend credits, 3 Gold credits, 3 Red credits
Easy Friend Vouchers
Go to any Morph Ball area that has the little roach-like critters on the walls. Simply roll back and forth dropping bombs to easily get hundreds of kills and lots of Friend Vouchers.
100% Ending
Collect all 100 pickups to view a Secret Ending clip after the game credits.
Extended Ending
Collect at least 75% or more of suit upgrades to view an Extended Ending once you complete the game.
Bumper stickers for ship
Purchase the "Bumper Sticker" bonus under the "Bonus Content" option. The stickers that will appear on your ship are relative to the game saves you have on your Wii hard drive. For example, having a save file for The Legend Of Zelda: Twilight Princess results in a large white Hylian logo on the very top hood, complete with the Triforce logo in the center. The following games have special decals: The Legend Of Zelda: Twilight Princess, Super Paper Mario, Wii Play, and Wii Sports.
Alternate ending sequence
Successfully complete the game with at least 75% of the suit upgrades collected to view an extended ending.
Revealing all item locations
Go to the area in Skytown where you must get the first part of the bomb you have to make using your ship. Near the bottom is some Phazite; shoot the switch inside to activate the satellite system. Go to the top, and go around the walls using the spiderball tracks and bomb all the bomb slots to get markers on your map revealing the location of every expansion (Missile, Ship Missile, and E-Tank) in every part of the game, except the items in the Valhalla.
Defeating Mogner War Golem (Boss of Bryyo)
To defeat Mogner War Golem (Boss of Bryyo), first dodge and jump over all of his attacks. While doing this, use missiles and your Power Beam to blow up the red orbs on his chest. Try this order: first the stomach, then the shoulders, and finally the back. Shoot them until they are giving off white light. Then, use your Hyperbeam to blow up the now white orb. Do this for all four of them. After you destroy one, the Golem will try to run into you and use his "little jump and create waves of pain" attack. Every time he is about to jump, use Morph Ball Bombs on his feet. They should explode, and you can continue fighting him. Also, when he starts to make red orbs come to his hands, blow them up or you will have to destroy his orbs again.
Defeating Pirate Berserkers
Use the following trick when you encounter a Pirate Berserker (which happens often). This large 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 approximately three times, a red light should pop up on his head. Go into Hyper mode, and start shooting at it.
Secret Message from Kenji Yamoto
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!
Secret Message from Miyamoto
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?
It’s fun, isn’t it?
I’ve also worked on many [Metroid] games, but this one is the best yet, don’t you think?
Definitely play it all the way to the end.
See you!
Stop the boss
When Aurora Unit 313 is on the ground and spinning around, you can use the Screw Attack to stun it.
Secret Message from Yoshio Sakamoto
When in Samus' ship, go to the radio and press the following symbols: Going from left to right, press the fourth symbol, the sixth symbol, the first symbol and then the seventh symbol.
You will then hear a message from Mr. Sakamoto, co-creator of the Metroid Series!
Quick Morph Ball Kills
To quickly kill 1,000 enemies (and achieve the Friend Voucher easily), try using the Morph Ball. The bugs that grab onto you as you scale walls can be destroyed with the bombs from the Morph Ball. Doing this continuously for a little while will net you 1,000 kills rather easily.
Foreign Language Clues
There are two foreign language Easter Eggs in the game, both Dark Samus related. In the beginning, if you examine the life support system, the screen will fill with seemingly-random letters. It's actually French, though, and reads "Vous mourez si votre resistance est forte," which translates to "You die if your resistance is strong." Near the end of the game, you will also find some German text, which reads "Kampfen Gandrayada, die Zahl von einer falschen freund." This translates to "Fight Gandrayada, the figure of a false friend" (though the German is technically grammatically incorrect).
Lever Friend Voucher
When you're on Bryyo fighting the two anti-aircraft turrets, you can get a secret Friend Voucher. You will get it when destroying the second of the three turrets. You'll need to pull three levers to open the fuel cells to destroy the device. If you manage to pull all three levers without a Space Pirate resetting any levers, you'll receive a voucher for "Perfect Execution".
GFS Olympus Voucher
At the beginning of the game when you are on the GFS Olympus, head to where your gunship is sitting. Adjacent to the ship will be two beacons that, when shot, will head upwards in the air. With careful firing, you can juggle the two beacons in the air, shooting them higher and higher. If you manage to hit one twenty times in a row without missing or the beacon hitting the ground, you will be rewarded with a friend voucher.
Frozen Reptilian Voucher
To get a secret Friend Voucher, head to Bryyo and freeze the reptilian enemies that throw boomerangs at you. It requires great timing, but freeze them with your Ice Missiles when they throw a boomerang at you. The boomerang will come back at the reptilian foe and kill it. An on-screen message will confirm that you have indeed gotten the voucher.
Unlimited Friend Vouchers
To execute this cheat, you'll need 2 SD memory cards. Copy and save your game from your Wii to one card, and then go back to your game on one card and send out your Vouchers. After you receive your Vouchers in return, save your game to the other SD card (so that you have an old save and a current save). Whenever you want to send more Vouchers, just save your game to the current SD card, reload the old save game, and send out more. Then reload the current save to receive the Vouchers. In this way, you can easily get as many Friend Vouchers as you want.
Harvest Voucher
In the Mining Zone of the Pirate Homeworld, use your gunship to destroy a Pirate Harvester. You'll receive a Friend Voucher in return.
Nova Beam Voucher
In the room where you battle enemies in order to acquire the Nova Beam, keep fighting until you've killed at least twenty enemies before you physically acquire the Nova Beam. You'll get a friend voucher for your efforts.
Killing Helios
To kill Helios easily, fire at the open spots on his body until he reveals his Phazon center. When he does this, quickly go into Hyper Mode, and then into Morph Ball mode, and attack him quickly for an easy kill.
Friend Credit Tips
Bowling for Bots: In Skytown, if you use Morph Ball to run over the Tinbots, you'll gain this bonus. Easiest place to do this is in the doughnut-shaped room.
Stylish Kill: In Skytown, there's a Bridge area that collapses when you cross it. Before it falls, there's a fight with Tinbots and the Master Bot. Ignore them and finish crossing the bridge. A cutscene with go off and show the bot fall to their doom.
Complete Ending
By finishing the game with a 100% rating (meaning you picked up all one hundred pickups in the game), you will get a special ending.
Hyper Missiles
The Hyper Missiles are earned in Hyper Mode after getting to Seed in Skytown. The Hyper Missile is the most powerful weapon in the game.