From the Super Mario Wiki, the Mario encyclopedia
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Keys are items used for various purposes that appear in many games of the Mario, Yoshi, and Wario franchises and their related media. Though their appearance and usage varies, they are typically used to open a locked door or a secret path.
Donkey Kong franchise
Donkey Kong Jr.
Donkey Kong Jr. (Game & Watch)
Donkey Kong (Game Boy)
In Donkey Kong for the Game Boy, keys make their first appearance 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 picks up the key by standing on it and lifting it above his head. 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 64
Donkey Kong Country Returns
In Donkey Kong Country Returns, there is a key known as a Map 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.
Super Mario series
Super Mario Bros. 2
Super Mario Bros. 2 is the first Mario game to feature keys and locked doors, both first appearing in World 1-2. 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 64 / Super Mario 64 DS
In Super Mario 64, there are only two Big Keys in the game, and they can found in two Bowser 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 Mushroom Castle. The first key opens the door to the castle's basement, and the second key opens the door to the castle's upper floors. If a player attempts to open the door to the upper floors with the basement key, a message will appear to let the player know that that key does not fit the lock.
In Super Mario 64 DS, the Big Keys retain their purpose from the previous game, but there are other kinds of keys. First, there are those that rabbits steal. The first key Yoshi has to obtain unlocks the Mushroom Castle; only after he catches the first rabbit can he get inside the castle. 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. The third kind of key is obtained by catching the eight glowing rabbits that randomly appear in place of the regular ones after 50 Power Stars have been collected. The key opens the white door in the character selection room, containing a secret Power Star.
Super Mario Advance 4: Super Mario Bros. 3
A Key appears in the World-e level Doors o' Plenty in Super Mario Advance 4: Super Mario Bros. 3. While it is carried in the same way as in Super Mario World, its function is to open Key Doors, as in Super Mario Bros. 2.
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.
New Super Mario Bros. series
In New Super Mario Bros., at the end of each World from 2 to 7, Mario faces off against a boss. If he wins, a Key will be granted. In New Super Mario Bros. Wii and New Super Mario Bros. 2, when Mario defeats any of the Koopalings at their castles, he'll receive a key that he must grab to exit the castle. This item doesn't serve any purpose other than finishing and closing the level. However, in the Coin Battle mode of New Super Mario Bros. Wii, the player that collects the key receives five coins.
Super Mario Galaxy 2
Keys also appear in Super Mario Galaxy 2, and they serve the same function they did in Super Mario Galaxy. They can be found in galaxies such as the Haunty Halls Galaxy and the Battle Belt Galaxy. They also briefly appear in the Rolling Masterpiece Galaxy.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
An update released on March 9, 2016 for Super Mario Maker allowed players to add keys to levels. They can be placed in blocks, or in an enemy, making them obtainable after Mario defeats it. Additionally, another new item included in the update, the Pink Coin, reveals a key once Mario collects every single one in the level. A key doesn't need to be directly held onto by Mario, as it automatically follows him after obtaining it, similar to the keys in the Yoshi's Island series. Up to eight keys can be obtained at one time.
Super Mario Run
Keys reappear in Ghost House levels in Super Mario Run, with their appearance from the New Super Mario Bros. U style in Super Mario Maker. They are used to unlock Key Doors, and can be found inside of Boos and ? Blocks. They are required to beat level 5-3: Boohind Lock and Key.
Super Mario Odyssey
Super Mario Maker 2
Keys return in Super Mario Maker 2. In the Super Mario 3D World style, they resemble the key symbols seen on Key Coins in the original game. In multiplayer, a player can stomp on another player who is holding a Key to grab the Key for themselves. If the player holding the Key is defeated, the Key enters a bubble, allowing other players to grab it.
Super Mario World animated series
A Key appeared in the Super Mario World cartoon episode "Mama Luigi", functioning just like its game counterpart. King Koopa shows it off, gloating that the Mario Bros. will never be able to find Princess Toadstool without it. However, Yoshi then eats it, and after Koopa retreats, he spits it out and it opens the cell the Princess was being held in.
Wario Land series
Wario Land: Super Mario Land 3
In Wario Land: Super Mario Land 3, the player can sometimes find a key inside a ? 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. However, he cannot be Small Wario as he needs to Body Slam the chest to open it (although breathing fire works).
Wario Land 3
While being absent in Wario Land II, keys reappear in Wario Land 3. Four differently colored keys are hidden throughout the level: a Gray Key (or Silver Key), Red Key, Green Key, and Blue Key. 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.
Wario Land 4
When Wario Land 4 was in development, Wario originally needed a key to unlock the four boxes (much like Wario Land 3) to gain the four Jewel Pieces. In the final game, Wario merely has to touch the box in order to open it. Besides the Keyzer, no other key is seen in the game.
Keys appear in Yoshi, after the player clears levels 22 through 24 of the B-Type game, rewarding the player 1,000 points.
In Super Mario World 2: Yoshi's Island, its remake, Yoshi's Island DS, Yoshi's New Island, Yoshi's Woolly World, Poochy & Yoshi's Woolly World, and Yoshi's Crafted World, keys can be collected and carried like Yoshi Eggs, taking 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.
Mario Party series
Bowser owns various keys in the Mario Party series. These so-called Bowser Keys are usually found in Bowser Minigames, 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. The minigame Locked Out from Mario Party 3 features keys with key heads shaped like mushrooms, flowers and stars.
Paper Mario series
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 are four Castle Keys. There is also a Grotto Key, which opens the door to the south area in the Pirate's Grotto.
Super Paper Mario
In Super Paper Mario, keys appear more prominently than in the previous installments. They are used in many levels to unlock doors.
Luigi's Mansion series
In Luigi's Mansion, Keys are used to unlock the different rooms of the mansion. Luigi can usually obtain a Key by completing a room, then opening a treasure chest. In some rooms, such as the Wardrobe Room or Bathroom, the Key spawns on a higher shelf. In the Fortune-Teller's Room, Luigi must utilize a specific method to acquire the Laundry Room key, by lighting all four candelabras using the Fire Elemental Medal.
Also, there are four special keys, with each one having a different card suit: heart, club, diamond, and spade.
Luigi's Mansion: Dark Moon
Keys return in Luigi's Mansion: Dark Moon, with a different design. They are again used to open doors and any key can be used to unlock a door. Keys disintegrate upon being used.
Luigi's Mansion 3
In Luigi's Mansion 3, keys can be found in places across the Last Resort. Their design is complementary to that of the architecture of the Last Resort, and they can be used to unlock locked doors, however a key can only unlock one door before shrinking into nonexistence.
Mario vs. Donkey Kong
In Mario vs. Donkey Kong, collecting Keys are essential to progress though the levels. Keys need to be carried to locked doors in order to open them and move on to the next area. Like with any other held item in the game, the Key can be thrown forwards and upwards, and will also be knocked out of Mario's hand if he is attacked. Unlike other items, Keys have a twelve second timer and will disappear and respawn at their original location when the timer is up.
In the Plus Levels, small Keys are attached to Mini Marios. Their purpose is the same as in earlier levels, but Mario cannot pick them up. Instead, they trail behind the Mini Mario as the toy moves. If the Key is brought the the locked door, the stage is cleared, but if the Mini Mario gets damaged, then the player has to restart the level.
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 has it in hand while approaching a gate, it will be unlocked.
Mario & Luigi series
Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
Blue Keys, Red Keys, and Green Keys appear as special items in Mario & Luigi: Bowser's Inside Story and its remake, Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey. They are found on the second floor of Peach's Castle, the last stage in the game, held by Fawfulcopters which Bowser must chase after. The Blue Key is required to proceed the storyline; the other two are optional. Earlier in the game, the Stingler and Star Panels behave like keys and open the doors in Pump Works and the Energy Hold, respectively.
Mario & Luigi: Paper Jam
Captain Toad: Treasure Tracker
Keys appear as items in Captain Toad: Treasure Tracker. They can be obtained from Pluck Patches, and always open locked doors. Akin to other items in the game, Captain Toad and Toadette carry the keys atop their head.
If a stage is cleared while a key is outside its Pluck Patch, the key rewards the player with one coin.
Super Mario Bros. 2
Yoshi's Island: Super Mario Advance 3
Luigi's Mansion series
Luigi's Mansion: Dark Moon
Luigi's Mansion (Nintendo 3DS)
Super Smash Bros. Brawl trophy
Names in other languages