Letter

Letters are objects in the real world that have made appearances in the Mario franchise.

Super Mario Bros. 3
Letters first appeared in Super Mario Bros. 3, Mario will receive letters from Princess Toadstool, which usually contain a helpful item and an adventure tip.

The last one is not from Toadstool, but from Bowser, saying he kidnapped the princess.

Super Mario 64
A letter appears in Super Mario 64. Mario receives one from Peach at the very beginning of the game, telling him to come to the castle to meet her, but as soon as he arrives, he finds that Bowser has stolen the Power Stars and kidnapped Princess Peach.

Super Mario Galaxy
At the beginning of Super Mario Galaxy, Princess Peach sends Mario a invitation to the Star Festival. Later in the game, letters are sent to Mailtoad, who then notifies Mario or Luigi when they arrive. In Super Mario Galaxy, letters are primarily sent from Luigi when he has become stuck in a certain galaxy and cannot get back without the player's help. The player will occasionally receive letters sent from Princess Peach, which express her concern at being kidnapped (though she is sure the player will rescue her), and also contain 5 or 20 1-Up Mushrooms.

Super Mario Galaxy 2
Super Mario Galaxy 2 also starts with Princess Peach sending Mario a letter to watch the Star Bits fall while they eat cake together. Later, letters are sent from a much wider range of characters than the first game, such as Gearmos and Jibberjays. They are used to accomplish a number of objectives, including notifying the player of any of The Chimp's challenges, giving the player tips on how to perform certain moves more expertly, advising the player of a special Power Star opportunity in a particular galaxy, offering the player advice and encouragement, challenging the player to a race, or making the player aware of any other special events or occurrences that may arise periodically as the game progresses.

Paper Mario
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At the start of Paper Mario, Princess Peach sent a letter inviting Mario and Luigi to her castle for a party.

Later on, Letters appear for the first time as items. They appear in a side quest. Parakarry dropped them all over the Mushroom Kingdom during delivery. Delivering them to whoever the letter is written to usually rewards the player with a Star Piece.

A large chain letter sequence appears as a long side quest. A letter at the end of Mt. Rugged starts the whole thing which will last until Chapter 7. At the end, the player will get the Lucky Day Badge. The player must have Parakarry out when giving a letter.

Mario and his partners also get letters from people all throughout the game, which can be checked at Mario's house and the Toad Town Post Office. Mario receives ten from the various characters he meets.

Paper Mario: The Thousand-Year Door
frame|right In this game, Mario no longer receives letters from people he meets. Instead, he receives e-mails on his Mailbox SP.

Before Chapter 5 of Paper Mario: The Thousand-Year Door, Podley has a letter for Admiral Bobbery written by Bobbery's deceased wife, Scarlette, who wrote it as she was lying on her deathbed. Delivering the letter to Bobbery strengthens his resolve and he agrees to accompany Mario to Keelhaul Key.

Luigi's Mansion
A letter also appears in Luigi's Mansion, which is one of Mario's missing items. It reads, "L-o-o-k--o-u-t--f-o-r--B-o-o-s,--L-u-i-g-i-!".