Debug mode (Official Dreamcast Magazine demo version)
Highlight "Skies Of Arcadia" at the main demo menu. Hold L + R and press Start. Keep L + R held while the game loads. While L + R are held, press Start, A(3) at the epilepsy warning screen. Release L + R. The message "CESA ROM Aug 8, 2000 10:13:12" will appear to confirm correct code entry. The debug menu will be in Japanese. Select the top option to access the scene selection screen. Change the default scene "103a" by pressing L, R, and the D-pad. Enter one of the following values to play the corresponding scene.
002x: Beginning of mini-quest
002y: Underground pirate hideout
002z: First battle of consecutive four battle sequence
090a: Game over screen
103x: Final (Boss) island sequence
103y: Sequence before mini-quest Boss
199a: End screen for "Laws Of The Air Pirates"
199b: End screen for consecutive four battle sequence
199c: End of mini-quest screen, no subquests done
199d: End of mini-quest screen, all subquests done
199e: Game over screen (Vyse down)
199f: Game over screen (Ship crashing)
199g: End of airship battle screen
199h: Ship and big fiery bird screen
202z: Sunset FMV sequence from start of mini-quest
399a: Ship battle sequence (first fight)
400x: Start screen for "laws Of The Air Pirates"
401x: Part four of "Laws Of The Air Pirates"
403x: Part five of "Laws Of The Air Pirates"
404x: Part three of "Laws Of The Air Pirates"
405x: Part two of "Laws Of The Air Pirates"
406x: Part six of "Laws Of The Air Pirates"
500a: Ship battle sequence (first fight)
518a: Ship battle sequence (second fight)
Getting items from Ilchymis
After finding Ilchymis, you can have her on your ship. Return to Crescent Isle, so that you can give her some money. She will build a boutique for you. The next time you return to Crescent Isle you will be able to buy items from her. From now on, buy all the items she has and give them to your party members and to Vyse. After the first session of buying things for your party, go outside then return back in again. You can now buy the same items. Once again, load up your party then get out. Repeat this as many times as needed. Check the menu to see if you have 99-9999 of items on your party members. Go into a ship battle or ordinary battle with these skills. If the enemies will shoot a magic spell on your team, the points will be 0 and you cannot take much damage.
Secret Aika FMV sequence:
When you begin the game and pass the part with Alfonso's ship, return to your island. Get out of the underground base of Pirate Isle. Aika will say that she needs to freshen up a bit. Go to her house, then face towards the door. Go all the way to the left left until you see a clothesline. In that one corner you will see, pasted on the wall of that house corner, a handkerchief. Inspect the handkerchief and you will see a hidden FMV sequence of how Aika looks with her hair down.
Secret specials
You need the Delpinus and at least 5 crew members to get these specials. Get your SP (spirit points) in battle to full and a crew SP icon will appear next to the item. This enables all of your active crew members to attack. Repeat these steps to get another special. You need all 4 people alive for this. This one combines the strength of all 4 people, and is the strongest special in the game.
When Vyse has his own ship, he is able to look for 22 crew members but you need at least 5 to do this. When you get 48 spirit points in battle (not ship battle), you can choose to use the Crew Special. It is the strongest in the game, depending what crew you have active -- they can heal you as well as attack the opponent.