Once Prince Paco has reappeared on the screen, start walking to the right, as you come to three Totem Poles who are spitting fireballs at you from their positions on this small platform above you; you will then have to jump up once you have reached the edge of the platform as you come up to three more Totem Poles, that are spitting fireballs at you from their positions upon another small platform above you. You shall then have to jump up once you have reached the edge of the platform as you come to three more Totem Poles that are spitting fireballs at you from their positions on this third small platform above you - and you will then come to a weighted platform, which has spikes on its underside. Once you have walked onto this weighted platform, it will slant downwards to the side that Prince Paco is standing on; once you have dropped in the area underneath it you will come to two Medusa Heads who are firing lasers from their eyes at you from their positions on the left and right sides of the screen. You may then collect six Bonus French Fries in front of you for 700 extra points apiece before jumping back onto the aforementioned weighted platform as it slants back and forth - and once you have done so, drop down once you have reached the edge of the platform as you come up to two more Medusa Heads who are firing lasers from their eyes at you from their positions in front of you, and on the underside of the platform above you. Once you have jumped over the third Medusa Head, then crouched under the fourth one jump up once you have reached the edge of the platform; once you have done so, the double doors on the right side of the screen will open up, and Prince Paco will walk through them, for his fourth and final boss encounter of the game (which will be very similar to the first, only with an added twist once you have won it. However, if you are playing the US version with the "WORLD SELECT" option set to "ON", you cannot finish this).
Once Prince Paco has reappeared inside that boss room, the Mole King himself will be standing in front of him; he has Princess Luxy imprisoned in the top-right corner of the room, and once she has called out to Prince Paco from the C140 he will tell him that he must beat him at a second Rock-Paper-Scissors minigame, if he wishes to rescue her. Once the camera's zoomed in on the characters, the Bunny Girl will appear in that top-left corner of the screen to give you an explanation for how to beat the Mole King, which is identical to the explanation she gave you for how to beat the Great Condor - and as with the Great Condor, you should remember that Rock (
) beats Scissors, Paper (
) beats Rock, and Scissors (
) beats Paper. The hands will be decided randomly by the slot machines at the bottom of the screen. If you have a winning hand, you may press the Jump Button to strike the Mole King with a hammer to win that round, but if you have a losing or tied hand and press the Jump Button to strike him anyway, he'll tell you that your strike was not fair (much like the aforementioned Great Condor would have), and you'll lose that round; if he has a winning hand, you must shield yourself, by pushing the joystick to the right (to prevent him from striking you with his own hammer), and the best of three wins this battle. Once you've beaten the Mole King at his minigame, he'll grow to twice his original size, and start flying around above Prince Paco while firing lasers at him once he has recovered from his stun - and those three Trident Crystals that the Guardian Fairies had given Prince Paco after he had rescued them in the three previous worlds will also start to revolve around him in a clockwise direction, at this point, and they must be used to attack the Mole King. Once you've struck the Mole King twenty-five times with the Trident Crystals, he shall explode, and the mirror in which Princess Luxy had been imprisoned will also shatter; she shall then fly down to Prince Paco's side as you receive 100000 points for each life you have remaining. The ground of the boss room will now start to shake beneath Prince Paco and Princess Luxy's feet...but they only have a single chance to escape, and it's not going to be an easy one!
Once Prince Paco has reappeared outside the boss room, with Princess Luxy holding onto his left hand, start walking to the right over a pit of lava that has eighteen fireballs jumping out of it (although they cannot reach you) and sixty-four logs (which will fall down as soon as you stand on them) over it; once you have walked onto each of the logs in turn, the forty-eight icicles on the underside of the platform above you shall fall down as you pass under them. Once you have bypassed them, you will come to a landing on the platform beyond this first pit of lava - and you will then come to a second pit of lava, which has seven more logs (which, once again, will fall down as soon as you stand on them), over it. Once you have walked onto each of them in turn, the forty-eight additional icicles on the platform above you will fall down as you pass under them; once you have bypassed them, you will come to landing on the platform beyond this second pit of lava. You will then come to this third pit of lava which has three more logs (which, once again, will fall down as soon as you stand on them) over it - and once you have walked onto each of them, in turn, the thirty-two additional icicles on the underside of the platform above you will fall down once you've passed under them. Once you've bypassed them, you will come to a landing on the platform beyond this third pit of lava; you will then come to this fourth pit of lava, which has two more logs (which will yet again fall down as soon as you stand on them) over it. Once you've walked onto both of these, in turn, the thirty-two additional icicles on the underside of the platform above you will fall down, as you pass under them - and once you have bypassed them, you shall come to a landing on the platform beyond this fourth pit of lava. You will then come to this fifth pit of lava which has three more fireballs jumping out of it (although, again, they cannot reach you) and three more logs (which, for a fifth time, will fall down as soon as you stand on them) over it; once you've walked onto each of them in turn, the forty-eight additional icicles on the underside of the platform above you shall fall down as you pass under them. Once you have bypassed them, you will come to a landing on the platform beyond this fifth pit of lava - and you shall then come to a sixth pit of lava, with twenty-four more logs (which, for a sixth time, will fall down as soon as you stand on them) over it. Once you've walked onto each of them in turn, the forty-eight additional icicles on the underside of the platform above you shall fall down as you pass under them; once you have bypassed these, you will come to a landing, on the platform beyond this sixth pit of lava. You will then have to jump into an enormous pirate ship that is swinging back and forth over a seventh pit of lava - and once you've used the movement of this pirate ship to be catapulted out of the cavern you will receive a "Clear Bonus" of 100000 points as the screen fades out. You can now sit back and enjoy the ending, which shows Prince Paco and Princess Luxy landing out of the cavern and watching the enormous rock in the centre of Marvel Land (which appeared on the background of Worlds 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, 2-4, 3-1, 3-2, 3-3, 4-1, and 4-2) sink to the bottom of the ocean before jumping up into the air.
After the credits have finished, the game shall go into "high-score" mode; your score shall most likely be the highest on the cabinet to date so you should enter your initials at the top of the table with pride. Once you've done so, the game will go back into attract mode.