Jotto

Jotto (or Giotto) is a logic-oriented word game played with two players, a writing implement, and a piece of paper with the alphabet on it. Each player writes a secret word and attempts to guess the other player's word.
Gameplay.
Each player picks a secret word of five letters and writes it down privately. Words must appear in a dictionary; generally no proper nouns are allowed. The object of the game is to correctly guess the other player's word first.
Players take turns: on a player's turn, they guess some five-letter word, and the other player announces how many letters in that guess match a unique letter in their secret word. For example, if the secret word is OTHER and the guess is PEACH, the E and H in PEACH match an E and an H in OTHER, so the announced result is "2". (Letters don't need to occur in the same position.) On the next turn, players reverse roles.
Players keep track on paper of each guess and result, crossing out letters of the alphabet that (by deduction) cannot appear in the opponent's secret word. Eventually, one player has enough information to win by making a correct guess.
History.
Jotto was invented in 1955 by Morton M. Rosenfeld and marketed by his New York-based Jotto Corp. In the 1970s, copyright passed to the Selchow and Righter Company. It is now made by Endless Games.