Typewriter mystery game
A typewriter mystery game was a specific type of typewriter art popular in the mid-20th century. A typewriter owner would be presented with a set of instructions: press a key this many times, press another key, move on to the next line. Upon finishing the typing, a picture would emerge on the page. First lines of a simple typewriter mystery could look like this: Typewriter mystery games were published in magazines (such as Woman's Realm and "The Journal of Business Education"), and collected in separate books. The “mystery” in the name refers to the fact that  a visual result of the instructions would sometimes be presented on a different page, in the following issue of the magazine, or withheld altogether, making typing the only immediate way to discover the picture. The end result of a typewriter mystery game would be a picture similar to the later ASCII art, except it would often use overtyping – making several passes over the same line, unavailable or difficult on computer screens. The photo would often be a portrait of a person or an animal.