The lusory attitude is the psychological attitude required of a player entering into the play of a game.^[1] To adopt a lusory attitude is to accept the arbitrary rules of a game, even though those rules often make the experience more challenging, in order to facilitate the resulting experience of play.^[2]

The term was coined by Bernard Suits in the book The Grasshopper: Games, Life and Utopia,^[1] first published in 1978, in which Suits defines the playing of a game as "the voluntary attempt to overcome unnecessary obstacles".^[2] He also offers a fuller definition:

"To play a game is to attempt to achieve a specific state of affairs [prelusory goal], using only means permitted by rules [lusory means], where the rules prohibit use of more efficient in favour of less efficient means [constitutive rules], and where the rules are accepted just because they make possible such activity [lusory attitude]."^[2]

For example, when two individuals play the pen-and-paper game Hangman, they aim to arrive at the same word through contrived means, thereby accepting the lusory attitude required by the game's rules.