The Goal of GruePhone 2.0 is to be able to play a number of text adventure games using nothing but an old phone. This will be accomplished using a small, ARM based embeddable computer called a “chip”. 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.
There was a prototype at the Bay Area Maker’s Faire in 2011.
You can follow the gory details in the blog.