Last year, Microgaming released a new online slots game based on Christopher Nolan's The Dark Knight movie series. Ever since the game was launched in June 2012, it has paid out many generous jackpots - several of which have made players into millionaires.

The Dark Knight slots game from Microgaming was released during the summer, just before the final installment of Christopher Nolan's film series hit theatres. PG SLOT The timing was…