zuma master1: what's your favourite kind of ball?  zuma master2: hmm, that's a tough one but i'd have to say the backwards ball on zuma
a magical ball in the computer game [zuma] which makes all the balls move in a backwards direction
"zuma master1: what's your favourite kind of ball?  zuma master2: hmm, that's a tough one but i'd have to say the backwards ball on zuma" What is the definition of "backwards ball"?