Mario Kart 64/Items

Items can be acquired by hitting an items block, a multicolored cube with a question mark on it.

Projectiles

 * Green Shell (Single) - A simple projectile. Travels in a straight line and bounces off of walls.  Makes a person who touches it explode.  You can hold a green shell behind you for protection against red shells and other projectiles. You can also fire it off backwards which is much safer than firing it off forwards where, depending on the track, you'll often just end up shooting yourself.
 * Green Shell (Three) - Three green shells orbit the driver until each of them is fired away. When fired, they act as single green shells do. While orbiting, they act as a shield that deflects any other attacks; however, each attack deflected takes away one shell.
 * Red Shell (Single) - An intelligent projectile. It locks onto the person one position in front of the player and attempts to crash into them. Watch out though as the red shells fly out in front and then, if the player who was in front of you slips back, the red shell will turn back and may hit you on route to the target player.  Red shells are also a good way of clearing out fake item-bombs, bananas etc.  You can trail a red shell behind you, in the manner of a banana or green shell, but they will always fire off forwards.  red shells often hit the edges of the tracks and self-terminate, so be careful where you fire them.
 * Red Shell (Three) - Three red shells orbit the driver until each of them is fired away. When fired, they act as single red shells do. They act as a shield in the same manner as three green shells.
 * Spikey Blue Shell - Targets the player in first place and hits as many people along the way as it can, but only if the intervening players get in the way. You can trail a blue shell behind you and then any players you hit while holding it are in trouble. Blue shells, like red shells, fly off and follow their own guided logic, tending to follow the exact middle of the track, except for corners where they can meander a bit.  Like red shells, blue shells that impact in the edges of the track self terminate.

Bananas and Bombs

 * Banana - These can be laid on the track. They cause players to spin out. You can trail a single banana and throw them forwards with limited accuracy.
 * Banana Bunch - A group of five bananas trail a player until they are released. When released they act as normal bananas do, but while in a chain behind a player then can be used to spin out a player that is following too closely.
 * Fake-item Bomb - These resemble item boxes, but when touched cause a driver to lose all speed and fly exploding into the air.

Mushrooms

 * Mushroom (Regular) - Increases the drivers speed to 80 km/h (top speed is usually 60 km/h) for a few seconds.
 * Mushroom (Triple) - Allows a driver to use a mushroom three times.
 * Mushroom (Golden) - Allows a driver to use an undetermined amount of mushroom boosts, depending on how fast they can press the button in a certain period of time

Misc

 * Star - Makes a player invincible to attacks and increases speed. If a player collides with someone with a star active it will cause them to explode into the air.
 * Ghost - Steals a random weapon from some other player and makes the driver invisible to other drivers for several seconds.
 * Lightning - Causes all other players to spin out of control and become small. As a consequence of their diminished size, players move slowly.  This state lasts for several seconds during which the user can flatten other drivers by colliding with their miniature form.  Players that are invincible via star and invisible via ghost are invulnerable to lightning, as are those in the middle of a long jumps or in the midst of being fished back onto the track.