LONDON – Ever wondered what a computer game would be like if you could speak directly to the main character? And what about if the action was taking place in real life?

Well wonder no more – British film company Realm Pictures has created an impressively in-depth "real-life" first person shooting game using actors on one end and some very surprised Chatroulette players on the other.

"Many years ago we experimented with the concept of 'random stranger' control - and one afternoon strapped a webcam to my head while someone followed me around with a laptop," Director David Reynolds told Mashable. "The idea stuck in my head - and eventually resurfaced while we were talking about fun projects for the summer. We decided to throw some of our indie film tricks behind it and see what happened."

To control the game, the baffled participants had to tell the "main character" what to do over a headset.

Actors dressed as zombies had to be quickly dealt with along the way.

As in any good FPS, there were hidden weapon upgrades.

And an epic Boss battle at the end.

The game – which was shot in and around the church the film company uses for its headquarters – took about a month to research and develop. Reynolds told us the "reset time" between games varied depending on how far through the player got before dying (that's right – the main character in the game actually has a proper health bar, which leads to a game over if they take too many zombie hits).

A lot of people were involved behind the scenes. "We had about 30 people here, manning the control room, playing zombies, running around collecting nerf darts," said Reynolds. "It was a great weekend - really good atmosphere, everybody had a lot of fun I think."

The video has already amassed well over 1 million views in just 12 hours. So what about a follow-up?

"We are just getting our first feature film projects off the ground," said Reynolds, "but our fanciful conversations about what 'level 2' could bring are now becoming a reality real quick!"