This is an implementation of the SoundWave paper on the web. It enables you to detect motion using only the microphone and speakers!
Is a survival game that uses the motion sensing to controll the player, you just need to move your hands near to the microfone of your computer/smartphone.
You can run the game with the flag --allow-file-access-from-files on chromium browser.
Unfortunately this doesn't work on Firefox since it doesn't seem to support the echoCancellation: false parameter to navigator.getUserMedia. This means there's no way to turn off it filtering out the sounds which are coming from the computer itself (which is precisely what we want to measure).