Wi-Fi Stars
Description: You can add stars to your profile name while Wi-Fi racing.

How to: By completing Grand Prix races with a certain rank. A one-star profile means you’ve earned a one star ranking on all Grand Prix races. A two-star profile means you’ve earned a two star ranking on all Grand Prix races. A three-star profile means you’ve earned a three star ranking on all Grand Prix races.

Large Karts
Description: unlock the large karts listed below, fulfill the requirements.
Aero Glider - Earn at least a one star ranking in each 150cc Retro Grand Prix races
Dragonetti - Win the 150cc Lightning Cup
Piranha Prowler - Win the 50cc Special Cup
Addition from mr caspartt

Avoiding POWs
Getting attacked with a POW can be a bummer, but if you flick upward your steering wheel or Wii remote, you can avoid it. You will spin around, and you will lose your currently-equipped item, but you won't slow down and will avoid the devastating result of being struck with a POW.

Large Bikes
To unlock the large bikes listed below, fulfill the requirements.
Phantom - Win the Mirror Cup
Torpedo - Unlock twelve Expert Staff ghost data in Time Trial mode
Twinkle Star - Win the 100cc Star Cup
Addition by mr caspartt

Quick Recovery -Mario Kart Wii (WII)
[Submitted by: Toebin ]
If you find yourself off the track you will be brought back by the game but forced to start over. To make up for lost time just hold down the Accel button just as you are dropped back on the track. You will notice a boost to your speed.

Bikes on 50cc Cup Races
To unlock the ability to drive bikes in 50cc cup races, earn all of the trophies on each 50cc cup race.

Your Name In Stars - Mario Kart (Wii)
[Submitted by: Toebin ]
In the online rankings you can get from one to three stars next to your Nickname.

Description: ONE STAR:
How To: Get a one star ranking in all Grand Prix

Description: TWO STARS:
How To: Get a two star ranking in all Grand Prix

Description: THREE STARS:
How To: Get a three star ranking in all Grand Prix

Victory Photos
Description: unlock both victory photos available in the game (which is basically a shot of your Mii with various characters), you have to fulfill two requirements. To unlock the first photo (which is of your Mii with Mario and Peach), earn a trophy in every cup for each class available. To unlock the second photo (which is of your Mii with each racer in the game), win each and every Grand Prix cup available in the game.

How to get Expert Ghosts - Mario Kart (Wii)
[Submitted by: Toebin ]
Beat a normal course ghost by seven seconds or faster.

Characters
Description: unlock the characters listed below, fulfill the requirements listed.

Baby Daisy	Earn at least a one star ranking in each 50cc Wii Grand Prix cup races
Baby Luigi	Unlock eight Expert Staff ghost data in Time Trial mode
Birdo	Defeat 250 people in online racing, or play Time Trial mode on sixteen different courses
Bowser Jr.	Earn at least a one star ranking in each 100cc Retro Grand Prix cup races
Daisy	Win the 150cc Special Cup
Diddy Kong	Win the 50cc Lightning Cup
Dry Bones	Win the 100cc Leaf Cup
Dry Bowser	Earn at least a one star ranking in each 150cc Wii Grand Prix cups
Funky Kong	Unlock four Expert Staff ghost data in Time Trial mode
King Boo	Win the 50cc Star Cup
Mii	To play as the Mii associated with your profile, win the 100cc Special Cup
Rosalina	Have a Super Mario Galaxy save on your Wii
Toadette	Play Time Trial Mode on all thirty-two courses

Medium Bikes
Description: unlock the medium bikes listed below, fulfill the requirements listed.
Dolphin Dasher - Win the Mirror Star Cup
Nitrocycle - Attain at least a one star ranking in all 100cc Wii Grand Prix cup races
Rapide - Win the 100cc Lightning Cup

Unlockable Bikes

Bubble Bike (small bike)	Win Mirror Leaf Cup
Dolphin Dasher (medium bike)	Win Mirror Star Cup
Quacker (small bike)	Win 150cc Star Cup
Shooting Star (large bike)	Win 100cc Star Cup
Sneakster (medium bike)	Attain at least 1 Star Rank for all 100cc Wii Grand Prix Cups
Spear (large bike)	Unlock 12 Expert Staff Ghost Data in Time Trials
Zip Zip (medium bike)	Win Mirror Special Cup
Phantom (large bike)	Win Mirror Special Cup

Small Bikes
To unlock the small bikes listed below, fulfill the requirements.
Bubble Bike - Win the Mirror Leaf Cup
Magikruiser - Play Time Trial Mode on any eight courses
Quacker - Win the 150cc Star Cup
Addition from mr caspartt

Unlockable Karts

Aero Glider (large kart)	Attain at least 1 Star in all 150cc Retro Cups
Blue Falcon (small kart)	Win Mirror Lightning Cup
Cheep Charger (small kart)	Attain at least 1 Star Rank for all 50cc Retro Grand Prix Cups
Honeycoupe (large kart)	Win 150cc Lightning Cup
Sprinter (Medium Kart)	Unlocked 24 Expert Staff Ghosts
Tiny Titan (small kart)	Beat 50 opponents during Wi-Fi play or unlock one expert staff ghost
Royal Racer (Medium Kart)	Win 150cc Leaf Cup

Mirror Class
To unlock the Mirror Class, win all of the available 150cc Cups in the game.

Alternate Title Screen
To unlock an alternate title screen that will be shown when the game is started up, win each and every cup available in the game.

Mario Kart (Wii) Golden Wheel
[Submitted by: Toebin ]
To get a Golden Wheel next to your name online just use the Wii wheel extensively in all modes.

Do that and you'll see your new gem (wheel) beside your name when you go online.

B-Dasher (Medium Kart)
Description: Unlock the medium kart called B-Dasher
How to unlock: You have to unlock all 24 expert staff ghost data entries. Below are the times needed to unlock them.

Bowser's Castle	03:04.836	02.55.017	02.42.098
Coconut Mall	02:30.764	02.24.788	02.13.333
Daisy Circuit	01:56.822	01.48.791	01.41.362
DK's Snowboard Cross	02:34.693	02.24.725	02.17.546
Dry Dry Ruins	02:30.949	02.21.681	02.14.286
DS Delfino Square	02:41.807	02.33.107	02.24.169
DS Desert Hills	02:10.233	02.01.141	01.52.686
DS Peach Gardens	02:34.894	02.29.006	02.16.777
DS Yoshi Falls	01:16.461	01.12.901	01.09.175
GBA Bowser Castle 3	02:58.304	02.50.637	02.39.391
GBA Shy Guy Beach	01:45.568	01.39.255	01.32.867
GCN DK Mountain	02:57.744	02.50.248	02.38.130
GCN Mario Circuit	01:59.771	01.55.267	01.49.939
GCN Peach Beach	01:34.233	01.30.698	01.23.140
GCN Waluigi Stadium	02:32.882	02.24.645	02.12.367
Grumble Volcano	02:28.237	02.19.524	02.11.852
Koopa Cape	03:03.022	02.54.897	02.41.370
Luigi Circuit	01:29.670	01:24.957	01:19.419
Maple Treeway	02:58.633	02.50.229	02.37.812
Mario Circuit	01:44.777	01.39.183	01.33.702
Moo Moo Meadows	01:37.856	01.33.571	01.25.909
Moonview Highway	02:16.802	02.07.016	02.04.163
Mushroom Gorge	02:16.110	02.05.494	02.01.011
N64 Bowser's Castle	03:19.323	03.06.723	02.55.933
N64 DK's Jungle Parkway	02:58.264	02.49.028	02.37.782
N64 Mario Raceway	02:14.799	02.07.915	01.59.053
N64 Sherbet Land	02:48.651	02.37.784	02.28.356
Rainbow Road	03:05.895	02.59.293	02.44.734
SNES Ghost Valley 2	01:06.595	01.03.752	00.58.907
SNES Mario Circuit 3	01:38.880	01.34.828	01.26.659
Toad's Factory	02:22.480	02.12.784	02.05.593
Wario's Gold Mine	02:19.583	02.14.932	02.04.800

Medium Karts
To unlock the medium karts listed below, fulfill the requirements listed.
Royal Racer - Win the 150cc Leaf Cup
Turbo Blooper - Win the 50cc Leaf Cup

Karts on 100cc Cup Races
Description: unlock the ability to drive karts in 100cc cup races
How to unlock: earn all of the trophies on each 100cc cup race.

Cups
Description: unlock the cups listed below, fulfill the requirements listed. Keep in mind that the requirements are the same for each CC type on the circuits listed.
Leaf Cup - Earn trophies in the Shell Cup and Banana Cup
Lightning Cup - Earn a trophy in Leaf Cup
Special Cup - Earn a trophy in Star Cup
Star Cup - Earn trophies in the Mushroom Cup and Flower Cup

Gold-Colored Steering Wheel
If you utilize the steering wheel that comes with the game extensively (or even exclusively) instead of using the Wii controller or a GameCube controller, you'll find a gold-colored steering wheel icon next to your name when you play online.

Small Karts
To unlock the small karts listed below, fulfill the requirements listed.
Blue Falcon - Win the Mirror Lightning Cup
Cheep Charger - Earn at least a one star ranking in all 50cc Retro Cup races
Rally Romper - In Time Trial mode, unlock the expert staff ghost data record