Mario Kart
To get a small boost while racing, get on a long straight road. You also cannot turn while doing this trick. If done correctly, you will see several blue streaks that fly behind you. Keep driving straight and you will see a blue force field in front of you. You then will get a boost for three or four seconds. This does not always work.
This trick requires a mushroom. The Blue Shell goes up and comes down. Before it hits, you will have time to use a mushroom and avoid the shell. You should boost forward and the Blue Shell should explode behind you.
You must be in first place to get a Blue Shell targeted at you. This trick also requires some sort of speeding item, such as a Speed Mushroom. Once the Blue Shell is above your head, use the speeding item just before it descends. It will make a large explosion behind you, but will miss. You can also avoid them by using the following tricks on the listed courses:
DK Summit: Go through the DK Cannon.
N64: DK’s Jungle Parkway: Go over the ramp the jumps over the yellow river.
GCN: DK Mountain: Go through the DK Cannon.
Rainbow Road: Go through the tunnel with the giant stars on each end.
To avoid a red or green shell, go on a DK Cannon if one is available. The shell will disappear at the entrance. You can also use this trick for clouds. They will disappear above you on the cannons and you will not be affected by them.
