when its locked you get the second ball in play, then when you lose it the locked ball should release and remain in play , also i think you can use it as a special on the drain outs on either side, yeah its definatlly addictive , what other games you got, i just got a gottlieb tee'd off from Mark C, hasn't arrived yet, can't wait! am looking for a genie(my all time fav) and a black hole, then when $$$$ and the wife let me a Pin2000 games starwars 1st episode and revenge from mars, had old wedgeheads back in the eighties but sold them, would like a couple of them as well, to get a good overall perspective of how pinballs has evolved, but love the stuff from the eighties and nineties.  @@*cheers Lenny