Quadral 27: Ghost in the Machine Hard

One word:

  1. Discussed in a philosophy course.
  2. Heard at a video game convention.
  3. A reason to call tech support.
  4. (Twist) It must be invisible or hidden.

AI will judge if your word fits—and if it's better than the AI's answer.

Need a hint?

The AI's answer has a number in the middle of it.