Key

Keys are items used for various purposes that appear in many games of the Mario, Yoshi and Wario series and related media. Though their appearance and usage varies, they are typically used to open a locked door or a secret path.

Super Mario Bros. 2
Super Mario Bros. 2 is the first Mario game to feature Keys and locked Doors. All keys in this game are guarded by Phantos, one of which will chase the player until the key is dropped or used to unlock a door. Unlike many other items in the game, Keys are always visible without having to be rooted up like a Vegetable.

Super Mario World
In Super Mario World, Keys and Keyholes can be found in various levels. Bringing a Key to a Keyhole activates the respective level's secret exit. Like other items in the game, Keys can be carried around and dropped or kicked upwards, but they will have no effect on a Keyhole unless held by the player. Yoshi can carry a key in his mouth, but will swallow it if it remains in his mouth for too long. The location of a Key does not reset when it is scrolled off the screen.

Super Mario World 2: Yoshi's Island
In Super Mario World 2: Yoshi's Island and its sequel, Keys can be collected and carried like Yoshi Eggs, taken up one space of the player's maximum number of Eggs. They can be used to unlock Mini Battle houses, locked doors in castles and Corks that block pipes. Additionally, during the cutscene following the defeat of a castle boss, a large key appears and unlocks a keyhole.

Super Mario 64
Keys appear in Super Mario 64. There are only two keys in the game and they can found in two Bowser's levels: Bowser in the Dark World and Bowser in the Fire Sea. Mario gets them when Bowser is defeated. The keys can open Doors of the Princess Peach's Castle. The first key opens the door of the castle's basement and the second key opens the door of the castle's upper floors.

Super Mario 64 DS
In Super Mario 64 DS, keys serve the same function as how they did in the previous, but there are more other kinds of keys. First, there are those that Rabbits steal. The first key Yoshi has to obtain unlocks Princess Peach's Castle; only after he catches that first rabbit can he get inside. There are many other rabbits that can be found in the game, but they only unlock minigames. The second kind of keys the player must collect are held by three bosses (Goomboss, King Boo and Chief Chilly), and are used to free Mario, Luigi and Wario.

New Super Mario Bros.
In New Super Mario Bros., at the end of each World from 2 to 7, Bowser Jr. places random boss and if the player wins, a Key will be granted.

Super Mario Galaxy
In Super Mario Galaxy, keys can be collected to automatically open locked doors or force-fields. They are found in galaxies such as the Gateway Galaxy and the Ghostly Galaxy. In the Gateway Galaxy and Ghostly Galaxy, a Grand Goomba and a Boo, respectively, each hold a key which is released after Mario or Luigi defeats the enemies.

Super Mario Galaxy 2
Keys also appear in Super Mario Galaxy 2, and they serve the same function as how they did in Super Mario Galaxy. They can be found in galaxies such as the Haunty Halls Galaxy and the Battle Belt Galaxy.

Donkey Kong (Game Boy)
Keys make their first appearance in Donkey Kong for the Game Boy in stage 1-1, after stage 0. In all regular levels of the game except for stage 0 (which has the stages from the original Donkey Kong arcade game), Mario has to find the key and take it to the correct locked door. Mario has take the key by standing on it and picking it up. Often, the key has to be thrown upwards because Mario cannot hold it while climbing a ladder, and it can also be used to take out enemies by throwing it.

Donkey Kong Country Returns
In Donkey Kong Country Returns, there is a key that can be purchased from Cranky Kong's Shop in each world, for a total of eight keys. Each key costs twenty Banana Coins, and when purchased, unlocks an alternate route on the world map that will allow Donkey Kong and Diddy Kong to reach additional levels.

Paper Mario
There are many key designs in Paper Mario and its sequel, but each only opens doors in the area they are found. There are Castle Keys for every castle and fortress, and various others keys in different locations. In Paper Mario, they were used in Tubba Blubba's Castle, Bowser's flying castle, and Peach's Castle. Tubba Blubba's keys look like three leaf clovers, while Bowser's look like a gold three leaf clover with a blue ball in the middle. There are about three of Tubba's keys and five of Bowser's keys. Peach's Castle Keys are pink versions of Bowser's. Also, a living key called Yakkey locked the Gusty Gulch Windmill.

Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, the Castle Keys that open the doors in Hooktail Castle are shaped like flowers. There is also a Grotto Key, which opens a door in the Pirate's Grotto.

Super Paper Mario
In Super Paper Mario, keys appear much more prominently than in the previous installments. They are used in nearly every level to open locked doors.

Luigi's Mansion
In Luigi's Mansion, Luigi had to collect many keys before he could advance to other rooms. They were usually found in Treasure Chests, although some could be found right out in the open.

Mario Party series
Bowser owns various keys in the Mario Party series. These so-called Bowser Keys are usually found in Bowser Mini-Games, and are necessary to escape from Bowser. In earlier Mario Party games, Bowser Keys are simply keys shaped like Bowser's head. In later games, they are engraved with Bowser's likeness.

Super Smash Bros. Brawl
In the Subspace Emissary mode of Super Smash Bros. Brawl, Emissary Keys are found somewhere near locked gates. If the player finds a key and tries to go through the gate while having it in his or her hand, the gate will become unlocked.

Wario Land: Super Mario Land 3
In Wario Land: Super Mario Land 3, the player can sometimes find a key inside a Face Block. These keys are hidden throughout many stages of the game and they are required to open the door to a treasure chamber. The keyhole in that the key fits is always found in the same stage as the key and the key can not be taken out of the stage, so it has to be recollected after leaving the level. Inside of the treasure chambers, Wario can find one of the collectible Treasures.

Wario Land 3
While being absent in Wario Land 2, keys reappeared in the game's sequel Wario Land 3. There, four differently coloured keys were hidden throughout the level, namely a grey, a red, a green, and a blue one. Wario can only clear a level if he finds one of the keys and manages to take them to their respective Treasure Chest. By doing so, he earns himself a new treasure that helps the player to proceed and find new levels. Usually, not all keys in a level are available from the start. The player has to obtain new abilities and meet certain requirements to find them all. After a key is taken to a Treasure Chest, the chest gets replaced by a Goal Door.

Notable Keys

 * Yakkey
 * Skeleton Key