The GNE Mystery is an Interactive Fiction (IF) game by Cal Henderson.
It takes place at the GNE offices and attempts to answer some important questions about GNE and Ludicorp.
You can grab a copy here (current release: 12). You'll need WinFrotz to play it (or a different interpreter if you're not using windows).
You can also play the game online by clicking here, as long as you have java. The downside is, you can't save your progress.