Mario Kart: Double Dash!!

There are two options to mushroom over the sand. The best area is right after the 3 cacti, straight towards the quicksand pit. The second is near the end: mushroom under the sign.

This is a really lame cheat but it works. First, select the battle stage as 'Nintendo GameCube.' Then, gather the maximum amount of bombs you can carry (20) and ride right into a corner. When your opponent moves in behind you to toss a bomb on you, quickly turn so that you are still facing backwards but so that you are perfectly aligned with your opponent. Then, fire all of your bombs, QUICK! Be careful not to wait too long or else your opponent will fire at you and gain a star. If your timing is right, the bombs will bounce off the wall, over you and right into your opponent. As soon as you hit your opponent for the first time, take your time shooting the rest of the bombs, because if you go into a frenzy your bombs will just explode on the ground while your opponent is flying in the air.

Hold down the "R" button while turning. Release it when the sparks turn blue.

To unlock the staff ghosts, you must beat these times (special cup is unknown):

Mushroom Cup
Luigi Circuit - 1'29"000
Peach Beach - 1'23"000
Baby Park - 1'14"000
Dry Dry Desert - 1'53"000

Flower Cup
Mushroom Bridge - 1'34"000
Mario Circuit - 1'44"000
Daisy Cruiser - 1'55"000
Waluigi Stadium - 2'02"000

Star Cup
Sherbet Land - 1'26"000
Mushroom City - 1'53"000
Yoshi Circuit - 2'02"000
DK Mountain - 2'15"000

When your on the course Daisy cruiser and at the part where the tables move and get hit by lighting you can go through the tables while your shirunk.

Hold down A at the start of a race. Your cart will not go for a few seconds. Go for double item boxes and use your items. You will probably get in 1st, 2nd, or 3rd.

After completing a Time Trial race (When it says Retry, Change Track, etc,), press L,R,L,R,X,Y,X,Y,Z. The code that pops up was for a Japanese contest. Totally useless, but it's interesting that they forgot to take that out.

Ok first you need to have mirror mode by beating everything on 150cc then you beat the first 2 cups.Then you face star cup on mirror mode and if you win you get king boo and petey pirahana and their first car pirahana pipes and if you win special cup (mirror mode) you can get the other car for king boo, which is the boo pipes.Good Luck!

If the Goombas on Mario Circuit are hit with a turtle shell, they will be squished into the ground and a boost will fly off them. If a thunderbolt is used on the course, it will squish them all and there will be several boosts lying in that area. It doesn't work the same as the mushroom cars; if you hit a goomba they stay solid and you spin around a bit. Turtle shells are you're best bet.

After the first tunnel, go right onto a dirt path (best used with a mushroom). Right before you cross the bridge, go onto one of the arches where you'll start hitting speed areas. Be careful to stay on because you lose a lot of speed if you fall off.