HOW IT WORKS

The components are headsets, currently made by Oculus, Sony, HTC, Samsung and Google, which attach to a phone or PC which will run the app or game.

The headset, which fits like goggles, contains a series of lenses that secure a display in front of your eyes. An input device, like a controller, can talk to the headset, to move forward or shoot a weapon, for instance.

The lenses create a life-size, 3D environment whichever way you turn. The device tracks your head movements and matches the image you are seeing accordingly, immersing you in the environment. Programs determine reactions to your choices, for example shooting a zombie will kill it.

The back-end tech includes a gyroscope, accelerometer and magnetometer.