Mario Kart Wii Cheats

Unlockable Karts
After meeting the requirements, some unlockables may require you to back out of your save file and reselect it.

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
Dragonetti (large kart): Win 150cc Lightning Cup
Piranha Prowler (large kart): Win 50cc Special Cup
Rally Romper (small kart): Unlock 1 Expert Staff Ghost Data in Time Trials
Royal Racer (medium kart): Win 150cc Leaf Cup
Turbo Blooper (medium kart): Win 50cc Leaf Cup

Quick Start
When the countdown starts wait till the 2 starts to disappear and then press and hold the 2 button. So the 2 must still be visible but disappearing.

This will give you a boost at the start of the race.

Boost when recovering from a fall
When you fall into something, such as water or falling from rainbow road, when you land, if you hit 2 at the moment you hit the ground, you get a temporary boost.

Alternate Title Screen and Ending Screen
Completing every single cup with a first place unlocks two new alternating Title Screens and one new Ending Photo.

Have a star by your nickname
Playing extraordinarily well in Grand Prix races can produce a Star Ranking upto 3 at the end results instead of the standard "C, B or A."

Collecting these stars in all Grand Prix's adds a Star Icon next to your name in WiFi Races and on the Results Screen for your opponents to see.

(Note: Say, if you get a Three star rating in every Grand Prix except one which you got a One star rating in. You would get a One starred nickname until you manage to upgrade the rank.)

Double starred nickname: Get a two star rating in every Grand Prix
One starred nickname: Get a one star rating in every Grand Prix
Triple starred nickname: Get a three star rating in every Grand Prix

More than one person can be the same character
First, make P1 choose the character you both want to be. Then unselect the character and move off of it. Move P2 over, and select the character. Go back one screen, then go into the character select again. You should both be on the same character. Both of you select the character. Do whatever you want from there on.

Note: In the character select screen and options, whenever one of you does an animation, both of you will. Also, if P2 chooses a different kind of vehicle than P1, P1 will look strange. Don't worry, this won't actually happen in the game.

I haven't tested this with P3 or P4 yet, but in theory, it should work.

Karts and Bikes versions of 50cc and 100cc
You can unlock Karts and Bikes versions of 50cc and 100cc(like 150cc, but slower) by completing all the cups in that CC. To activate these versions, press the + button on the Speed Select screen.

100cc(Kart and Bikes): Place 1st, 2nd, or 3rd in all 100cc cups
50cc(Karts and Bikes): Place 1st, 2nd, or 3rd in all 50cc cups

Change Mii Racer weight class
Go into the Mii Channel and change your Mii drivers weight, witch will have an in game impact causing you to change weight class and have different cars.

POW Block Immunity
When you see the POW block on your screen and its about to hit you, just do the function you would normally use for a trick to create a shockwave for youself to become immune to the spin out the POW block creates (Control panel on GCN controller, Shaking Wii wheel, etc.). This can be done on both bikes and carts. Even though you don't loose speed or spin out, you still will loose the items you were carrying.

Unlockable B-Dasher (Medium Kart)
To unlock the medium kart called B-Dasher, you have to unlock all twenty-four 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