So... you think this post is going to be about unfinished and/or cancelled games...
Well you're wrong!
After accidently discovering an audio-only game called BlindSide on the Desura site I decided to have a rummage around the Internet to see if I could find any more titles like this and discovered the unique, strange, and sometimes apparently quire disconcerting world of Audio Games.
Audio games seem to have their roots in the add-on speech synthesisers that could be used with some old-style text adventure games (or interactive fiction, as they are now known) before a niche market for games aimed at the blind user emerged. With the advances in sound control these games made came an opportunity to appeal to a wider, and more commercially lucrative, audience. The Audio game is fast becoming a recognised subgenus that is now making some important inroads into mainstream gaming platforms.