And you wouldn't have to do anything more than play a computer game on your phone.

BBC: Can an app help find cancer cure?

Game play is decided by a computer on the side of the pitch.

BBC: NEWS | Technology | Robotic footballers have a ball

They all use game play as a way to make the logic of computer programming accessible and relevant to kids in their formative years.

FORBES: Microsoft Launches 'Kodu' Game Design Challenge For Younger Kids

Then the big boys with global licences arrive: Lego to make construction kits (build your own Hogwarts castle), Mattel to make Harry Potter toys, and Electronic Arts computer games including, finally, a chance to play the obscure game of Quidditch (a bit like an aerial version of polo, but with the contestants flying on broomsticks).

ECONOMIST: Harry Potter and the publishing goldmine

It was one of the first times in computer game history where gamers could simply connect to their ISP, start a game and choose to play via the Internet from the multiplayer option screen.

CNN: Online gaming: the state of the Net