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Collect all 100 pickups to view a Secret Ending clip after the game credits.

Successfully complete the game with at least 75% of the suit upgrades collected to view an extended ending.

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

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.

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

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.

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.

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.

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

Beat the game and you will get Hyper Mode Difficulty.

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

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.

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.

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 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!