The replay function is the red light next to the left flipper. If you lose your ball 
and the red light is on, you will get another ball. The replay action is better than 
an extra ball because when you lose, you do not abort your missions and do not have to 
start all over again. To get the replay function light on, you have to open the 
wormholes by hitting the Space Warp target (the small red button near the entrance of 
the Hyperspace chute). The wormhole lights will then light up to a color (red, yellow, 
or green). You now have to get the ball in the wormhole of that color to turn on the 
replay function.