Controlling units entirely through JavaScript, the player must contrive to program their units to handle whatever situations the game's sandbox will throw at them, even while the player is offline.

But once they came up with a story about a 1980s-era video game programmer trying to adapt a choose-your-own-adventure novel, it made sense for “Black Mirror” to put its own twist on the device.

It is similar to an old Galaga style game with the following features. The objective is to learn using JavaScript programming through making Space Shooter Game.