Before the 20th century children had few toys and those they did have were precious. Furthermore children did not have much time to play. Only a minority went to school but most children were expected to help their parents doing simple jobs around the house or in the fields. Egyptian children played similar games to the ones children play today. They also played with toys like dolls, toy soldiers, wooden animals, ball, marbles, spinning tops and knuckle bones (which were thrown like dice). The industrial revolution allowed toys to be mass produced and the gradually became cheaper. Many new toys were invented in the 20th century. In the late 20th century with the arrival of an affluent society plastic and metal toys became much cheaper and much more common.