With an unerring eye for a good story and a marvellous ear for the voices of the people he meets, Alex Bellos describes the startling range of football spinoffs found in Brazil; from Autoball, literally football with cars and a giant leather ball to Ecoball, played in the heart of the rainforest, from Button football ...

The Mega-Sena is the largest lottery in Brazil, organised by the Caixa Econmica Federal bank since March 1996.