Phelios/Stage 3

Area 1
Once the enchanted mirror has faded back out (and Pegasus has started to propel Apollo forward once again), three more Item Flies will come flying down towards him (from the top of the screen); once you have fired a shot from your sword and the three beams adjacent to it at them to kill them, they will leave two "S" and an "O" powerup behind and announce their names in Japanese from the C140. Once you've collected them, twenty-one Ropers will emerge from the ground in the centre of the screen, and fire yellow shots at you from their singular eyes - and once you fire a shot from your sword and the three beams adjacent to it at each of them to kill them, thirty-two Graia will come zigzagging down towards you from the top of the screen, while firing projectiles at you. Once you've fired a shot from your sword and the three beams adjacent to it at each of these, to kill them, ten Doragon will come flying down towards you from the top of the screen while spitting flames at you; once you fire a charged shot from your sword and the three beams adjacent to it at all of these to kill them, twenty-five Blue Will-O-The-Wisps will fly towards you from the left side, right side, and top of the screen. Once you've fired a charged shot from your sword (and the three beams adjacent to it) at each of these to kill them, six more Graia will come zigzagging down towards you on the left side of the screen, while firing projectiles at you - and once you've fired a charged shot from your sword (and all three beams adjacent to it) at them to kill them, six more Graia will come zigzagging down towards you on the right side of the screen, while firing projectiles at you. Once you've fired a charged shot from your sword and the three beams adjacent to it at each of them to kill them, three more Item Flies will come flying down towards you from the top of the screen; once you've fired a charged shot from your sword and the three beams adjacent to it at these, to kill them, they will leave two more "S" and another "O" powerup behind and announce their names in Japanese from the C140. The three-script Japanese text ''Pe ruboreosu no sora ha Gurifon no sumika. Kiwotsukete!'' (ぺルボレオスの空はグリフォンの住処. 気をつけて!) will then appear at the bottom of the screen as the two enormous rocks on both sides of the screen open up in front of Apollo - and he will now descend down to the second area of the stage beneath him. The song you were hearing from the Yamaha YM-2151 will also change once he has landed; Pegasus will also speed up for the duration of the next area of the game.

Area 2
Once Apollo has landed, Pegasus will continue to propel him forward as the three-script Japanese text Gurifon ni notta kishi ga oikakete kuru wa!! (グリフォンに乗った騎士が追い掛けてくるわ!!) appears at the bottom of the screen, while four Black Griffons come flying towards you from behind; once you have moved out of their flights and fired a charged shot from your sword and the three beams adjacent to it at each of these to kill them (they will also die if they crash into the rocks), you will come to twelve Green Griffons, who are trying to stay ahead of you. Once you fire a charged shot from your sword and all three beams adjacent to it at each of them to kill them (again, they will also die if they crash into the rocks), a seventh Item Fly will come flying down towards you on the left side of the screen - and once you have fired a charged shot from your sword and the three beams adjacent to it at him to kill him he will leave an "L" powerup behind and announce its name in Japanese from that C140. Once you collect this, it will either restore one of Apollo's lost life-hearts (if he was unfortunate enough to take a hit during the course of the game) or grant him an additional fifth one (if he was fortunate enough to not yet take a hit, during the course of the game); eight more Black Griffons will then come flying towards you from behind. Once you have fired a charged shot from your sword, and the three beams adjacent to it, at each of them to kill them (once again, they will also die if they crash into the rocks), the three-script Japanese text Seiren no shinden (セイレンの神殿) will appear at the bottom of the screen, as Apollo descends down to and enters the temple of Siren (which looks like a gold version of Medusa's, and is the basis for the last area) - and the song you were hearing from the Yamaha YM-2151 will also fade out at this point. Pegasus will also go back to his normal speed for the duration of this next area of the game; in fact, he will remain at this speed for the rest of the game.

Area 3
Once Apollo has reappeared inside the temple and its theme starts to be heard from the Yamaha YM-2151 three more Item Flies will come flying down towards him on that left side of the screen; once you've fired a charged shot from your sword and all three beams adjacent to it at them to kill them, they'll leave two more "S" and a third "O" powerup behind and announce their names in Japanese from the C140. Once you've collected them, five Type A Dokuro-Hei will come running into view from the right side of the screen, and throw their axes up at you - and once you have fired a charged shot from your sword (and the three beams adjacent to it) at these to kill them, five more Type A Dokuro-Hei will come running into view from that left side of the screen, then throw their axes up at you. Once you have fired a charged shot from your sword and all three beams adjacent to it at these ones to kill them, the three-script Japanese text Utsukushī sugata ni damasa rete wa dame...Seiren ha osoroshī majo yo! (美しい姿にだまされてはダメ...セイレンは恐ろしい魔女よ!) will appear at the bottom of the screen as you come to the sleeping Siren in her human form; the game's "boss" theme will then start to be heard from that Yamaha YM-2151 once again, as she wakes up, transforms into a giant eagle, and starts launching feathers from her wings at you (which can be destroyed for 60 extra points apiece), while occasionally spitting fireballs from her beak at you (which cannot be destroyed, and must be avoided). Once you have fired enough charged shots from your sword and all beams adjacent to it at her to defeat her, she will explode, and the three-script Japanese text of Aporō ha, Seiren wo taoshita. (アポローは、セイレンを倒した.) will appear at the bottom of the screen - and Apollo will then proceed to that enchanted mirror at the back of Siren's temple as Artemis's theme begins to be heard from the Yamaha YM-2151 for the second time. Once it fades in, Apollo's twin lover will speak the three-script Japanese text of Aporō...Anata to sugoshita, Dirosu no oka ni kaeritai. (アポロー...あなたと過ごした、 ディロスの丘に帰りたい.) from the C140 as it appears at the bottom of the screen; the image will then cut to a shot of a beach at sunset with a silhouette of the twin lovers in the foreground and the Parthenon in the background. Once it has faded out again, the game will segue into the fourth stage - which is only comprised of two areas and will also be the last one if the arcade owner had set the "RANK SELECT" setting in the options menu to "ON" and you had chosen to start in "EASY" mode. It's also worth noting that if Apollo flies into the Siren-eagle during this stage, the impact will kill him instantly regardless of how many life-hearts he has.

''Note: If Apollo is too close to Siren's body when it explodes, he shall lose a life-heart if he gets caught in the blast; if it was his last one, the blast shall kill him, but the game shall still proceed to the enchanted mirror at the back of the temple as if he was still alive, then resurrect him for the start of the fourth stage (unless the life that he lost was his last one, in which case it will once again proceed to the continue screen after the enchanted mirror fades out). As in Splatterhouse, if you want to continue playing after losing your last life, you will have to select "YES" within ten seconds of inserting another coin.''