The Goal of GruePhone 2.0 is to be able to play a number of text adventure games using nothing but an old phone. I have recently expanded this into other text based games like Hunt the Wumpus. This is accomplished using a small, ARM based embeddable computer called a “chip” from a company that has since gone under. This will read the descriptions to the user via a text-to-speech (TTS) engine, and listen for user input via a speech-to-text (STT) engine and feed that back to the game.
The goal of GruePhone 1.0 was to port Zork I (via a z-code interpreter) to an embedded platform, and enclose that and an old modem inside a telephone, so that the game can be played from a teletype, TDD, or old computer with an acoustically coupled modem.
GruePhone 2.0 was displayed at Bay Area Maker’s Faire, May 19th through 21st, 2017. Version 1.0 was exhibited at the faire in 2011.
You can follow the gory details in the blog.