Once all three Ghostbusters (and Slimer, if the one who beamed up that Green Ghost ghost on that previous stage did not die after beaming it up) have reappeared on the screen, six Type 13 enemies shall start hovering down towards them from the top of the screen; once you have fired enough shots at each of them to kill them for 300 points apiece, they'll leave six ghosts behind (but if you do not kill them quickly enough, they shall each hatch into three miniaturized Type 10 enemies, which are worth 150 points apiece, and can increase your ghost count by a maximum of eighteen). Once you've beamed them all up, you'll have to fire a shot at two gravestones to destroy them - and once you have done so, they will leave two Type 4 enemies behind. Once you have fired a shot at both of these to kill them, they will leave two more ghosts behind; once you have beamed both of them up, you will have to walk diagonally north-east and up, as you come to nine more Type 4 enemies. Once you've fired a shot at each of them to kill them, they will leave nine more ghosts behind - and once you have beamed them all up you will have to continue walking up as eight Type 1 enemies come flying towards you from the left and right sides of the screen while sticking their tongues out at you. Once you've fired a shot at each of them to kill them they shall leave eight more ghosts behind (two of which have a Shot Power Up and Green Ghost powerup inside); once you have beamed them all up, Slimer shall reappear and start circling around your Ghostbuster again (if he died after beaming up the first Green Ghost ghost, but if he did not, the powerup will have no effect).
You shall then have to walk diagonally north-east and up over one of twelve angry-looking spikes (while they have receded into the ground), and collect three Beam Energy Up powerups; once you've done so, you will have to walk over a second of the twelve angry-looking spikes (again, while they have receded into the ground), as three fullsized Type 10 enemies come flying towards you from the top of the screen while firing lightning bolts at you. Once you've fired a shot at each of them to kill them they shall leave three more ghosts behind (one of which has an Aura Power powerup inside) - and once you have beamed them all up a protective barrier will appear around your Ghostbuster for a short period of time. You will then have to continue walking up as you come to two Type 6 enemies who are walking back and forth while firing lightning bolts in eight directions to you; once you have fired enough shots at both of them to kill them, they'll leave two more ghosts behind. Once you've beamed both of them up, you will have to fire a shot at the second and third of two more gravestones to destroy them - and, once you've done so, they will leave a fourth Beam Energy Up powerup and a twelfth Type 4 enemy behind. Once you collect the Beam Energy Up powerup and fire off a shot at the Type 4 enemy to kill him, he will leave a ghost whose number can range from 37 to 55 behind; once you've beamed him up you will have to continue walking up as you come to a third Type 6 enemy who is walking back and forth while firing lightning bolts in eight directions at you. Once you've fired enough shots at him to kill him, he'll leave a ghost (whose number can range from 38 to 56) behind - and once you've beamed him up, you will have to continue walking up over one of twelve more angry-looking spikes (once again, while they have receded into the ground), as you come to three Type 9 enemies, who are firing shots in eight directions at you. Once you have fired enough shots at them to make them recede back into their tree stumps and kill them, they'll leave three more ghosts behind; once you have beamed them all up you will have to fire a shot at a gate to destroy it (but if a Ghostbuster is standing directly in front of it, his shots will just go over it).
You will then have to continue walking up as four more Type 13 enemies and a thirteenth Type 4 enemy come hovering and walking down towards you from the top of the screen; once you've fired enough shots at each of them to kill them, they will leave four more ghosts behind (but again, if you do not kill the Type 13 enemies quick enough, they'll each hatch into three miniaturized Type 10 enemies which can increase your ghost count by a maximum of twelve). Once you've beamed all of these up, you'll have to fire a shot at the second and third of three more gravestones, to destroy them - and once you've done so, they will leave two more Type 4 enemies behind. Once you've fired a shot at both of these to kill them, they will leave two more ghosts behind; once you have beamed them all up, the game's "boss" theme shall start to be heard from the Yamaha YM-2203 and YM-3812 as four Type 14 enemies appear, and start walking down towards you from the top of the screen while extending their heads towards you. Once you have fired enough shots at each of them to kill them, for 1000 points apiece (they won't leave ghosts behind), you'll have to walk to the left as five more Type 14 enemies appear and start walking down towards you from the top of the screen while extending their heads towards you - and once you fire off enough shots at each of them to kill them a key shall appear in front of the double doors. Once you have collected the key the double doors will open up; once all three Ghostbusters have walked through them the text "STAGE CLEARED!!" will appear on the screen for a third time. The "Ghost Storage" theme will then start to get heard from the Yamaha YM-2203 and YM-3812 for a third time as all three Ghostbusters walk up to it and deposit their beamed-up ghosts into it - and once they have done so, they shall proceed to the fourth stage (where the Type 14 enemies reappear as regular, ghost-leaving enemies).