Metroid Prime 3: Corruption

Look closely on planet Phaaze just before you fight Dark Samus to find a body of Metroid Prime. You can even scan it.

You can jump in Morph Ball mode without laying a bomb. Tilt the Wiimote up quickly in Morph Ball mode and you will jump. You can do an air bomb jump but cannot jump twice. For example, you can jump, lay a bomb, jump, then get propelled higher by the bomb. You cannot use a second bomb to propel you.

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.

Phazon will not hurt you. Instead, you can actually stand in it and have it become energy for your suit. Only three Phazon pools exist.

Bryyo: It is on the story path. It is where you first encounter corruption.
Bryyo: Underneath the big Golem that says you cannot move it. When you get the new visor, go back to the area just before the grapple swing. You encountered Reptilicus Hunters here. Go to the Golem's head. Activate the "new visor" and use the terminal inside. The Golem will activate and move, revealing a Phazon pool and two Phaazoids. One of them becomes a Red Phaazoid.
The fourth planet: Just before fighting the Pirate Commander (he has the red Phazite armor), the Phazon is on the ground. This room also includes a scan about Gandrayda. Also, scan the commander as he is unique.

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.

After you get the spider ball, go back to the Chozo astronomy lab in Skytown, Elysia. This is the place where you get into a light up bomb thing as a morph ball, and magnifying lenses move to a position and a probe is sent into the sky that gives you maps. Enter all the bomb things, one by one. After all of them have been used, you should have maps for all of the planets and positions of upgrades. They will come up as a sphere, and if they are acquired, they will become an X.

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 you fight Rhundas you can sometimes get him stuck in wall by firing a missile when he is directly in front of it. Once you do this, he will stay in his neutral position and can be killed easily.

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.

After you destroy the first Seed, look at the reflection of Samus' eyes in her visor when the scanning visor is equipped. You can see black streaks of Phazon on her face that get progressively larger after each Seed is destroyed.