I offered this ball to my 6 year old daughter, sad because she had her leg in plaster and was looking for something or she can play alone. The ojectif is to move a ball along a path sometimes "twisted". Progress is numbered from 1 to 85 and there are two intermediate steps (lets leave 1/3 or 2/3 of the course). This is taking my daughter arrives to 30 after a week and big kid myself that I am, to 55 if I remember correctly. You have to concentrate, have flexible and precise gestures and good nerves .... :-)
