The bonus ghost for this fourth scene is Red Ghost (
), which is worth 5 points, and a total of 285 points are required to continue to the final scene.
Once the electro-mechanical diorama has been lit up, six Mr. Jow and six Piranha will make their way to the crumbled house from the top left of the screen. Once you have fired a shot at each to kill them, six more Piranha, three on each side of the screen, will appear nearby the crumbled house and sunken ship respectively and more in an "S" shaped formation; and once you have fired a shot at each to kill them, three more Mr. Jow will fly in from the right side of the screen, again in a "V" shaped formation. Once you have fired a shot at each to kill them, a materialization cloud will appear in the right cavern, and the treasure chest will open up, as three more Piranha and one Red Ghost will appear out of them respectively - and once you have fired shots at each to kill them, the sunken ship will move slightly to the left, and three materialization clouds will appear from the crumbled house and both caverns, as six Pirahna, three Mr. Jow and two Red Ghost appear out of them all respectively. Once you have fired a shot at each to kill them, the clam will open, the sunken ship will move slightly toward the left, and three more materialization clouds will appear of out, again, the crumbled house and both caverns, as three more Mr. Jow, two Piranha and one Red Ghost emerge from them - and once you have fired a shot at each to kill them, two more materialization clouds will form at both caverns, as six Tosu and six Piranha appear from them and make their way toward the edge of the screen. Once you have fired a shot at each of them to kill them, the treasure chest and clam will open, as six more Mr. Jow and six more Tosu emerge from them respectively - and when you have fired a shot at each to kill them all, two more materialization clouds will appear from the right cavern and crumbled house, as six additional Mr. Jow and six Piranha will emerge from them and make their way towards the sunken ship. Once you have fired a shot at each to kill them, a large amount of black bubbles will combine together to form Boss Bubble Ghost, and he will simply move around the screen in a spiral pattern; and if you manage to defeat him before the timer runs out, not only will he explode and seven Bubble Ghost and two Red Ghost emerge from him, but the player will also receive a time bonus, which varies based on the time remaining on that scene. If you scored 285 or more points, then the text "SCENE 4 CLEAR" will appear on the screen as the electro-mechanical diorama will turn off the lights; the scoreboard will appear, as the "ZIP" box will be lifted over the "GHOST" box, as the text "ZIP WON!" appears on the screen, and the player will move onto the next scene; however, if you scored less than 284 points, than the text "SCENE 4 OVER" will appear instead, and the "ZIP" box on the scoreboard will be dropped to the bottom of the screen, as the text "GHOSTS WON!" appears, and the game will then be over. If you did score 285 or more points though, you will move onto the fifth and final scene as the scoreboard screen will fade out.