Hyperspace is one way to earn extra balls. The other way is to upgrade the three 
flags directly above the drainage chute three times in quick succession. Each time 
you do, another light below the flags will light up. Get all three to light up 
together to earn an extra ball. This has the advantage over the hyperchute, as you 
are in complete control. With hyperspace, the ball still has to go into one of the 
launch chutes to earn the extra ball -- and it is a matter luck if that happens or 
not.