Take a look in the Research Team > Induction Techniques board and take a look at 'Lucidity via Computer Games'. It is a similar (if not basically the same) technique as the hypnosis one, as the game acts to bring the player into a trance if you like, and one of the theories that is running with it right now is that while in the trance state the game creates, the MP3 that is running in the background can write the suggestion to your subconcious much the way hypnosis does.