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

That game was designed to look as good and play as well as traditional video games from Electronic Arts or Activision Blizzard, but be distributed and played online in real-time.

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