HTC Vive needed.
Set the audio output of the computer to headphones.
Give one player the Vive controllers, another one the Vive Head-Mounted-Display, and another the headphones.
Execute the executable.
Game Design: Andrea D'Acunzo and MariaVittoria Patti
Programming: Andrea D'Acunzo
3D Art: MariaVittoria Patti
Sound design and Soundtrack: Shaun Elwood and Dafydd Anthony