Someone's Playing Doom On Sound Waves
Briefly

"The game is displayed by generating an audio signal that can be viewed as a spectrogram, while input is taken from the microphone, with specific frequencies being mapped to specific keys," explained Wojtek-Graj.
As you might expect, nobody was upset about Wojtek-Graj sharing such a cool port of Doom on the subreddit.
Read at Kotaku
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