Portal: Terminal's first map (early version) file

Portal: Terminal is a mod that takes place in an Aperture employee's hard drive. The tests on this drive are mostly in an uncompleted state, never assembled in the real world, some with good reason. That's where you, a piece of code acting as a hypothetically perfect test subject, come in. Partway in the game, the hard drive begins failing, something your guiding AI cannot save you or itself from, leading to a journey through circuits and sentience.