Duplo are blocks twice the size of Lego. There are also Quatro blocks which are twice the size of Duplo. These have been discontinued: http://lego.wikia.com/wi

Duplo are blocks twice the size of Lego. There are also Quatro blocks which are twice the size of Duplo. These have been discontinued: http://lego.wikia.com/wiki/QUATRO http://lego.wikia.com/wiki/QUATRO