Successfully complete the game. When you start a new game, you can immediately advance to the end. Select the "Leave Tomorrow" option at the hotel or pool menu to skip to the ending.

Wait for the credits to end to see a extra FMV sequence featuring Zack and the remains of his island.

Enter to the options menu, then change Zack's language to Japanese.

Earn or buy swimsuits in story mode (Zack's Island). The swimsuits that you acquire in that mode will also be available in exhibition mode.

To enable this cheat, you must first start a game and give heaps of gifts to the same person. Now finish the game you are in and begin a fresh one using your old saved game file and choose the person you gave the gifts. As this person, you should now have all of the gifts you gave previously, for free!

Your DOA3 Survival Mode scores for each character are directly related to their starting money in DOAX. The default starting money is 10,000, but for example if your survival mode score with Tina is 50 then Tina will start with 50,000 in DOAX

You can unlock two hidden music tracks in the game: "How Crazy Are You" (by Meja) and "Is This Love" (by Bob Marley). To obtain them, play through the game once. When you resume that saved game file, these two hidden songs will be available in the Radio Station.

Ayane:
Peridot, Beauty Treatment, Marrons Glace, Shuriken

Christie:
Turquoise, Tomato Juice, Steering Wheel, Collar, Animal Prints

Helena:
Garnet, Blancmange, Seaworld Ticket, Dolphin Brooch, Dolphin Clock, music or opera items

Hitomi:
Emerald, Sachetorte, Frying Pan, Microwave, Recipe

Kasumi:
Amethyst, Strawberry Millefeuille, Crystal Ball, Tarot Cards, Shuriken

Lei Fong:
Diamond, Chinese Dessert, Aroma Pot, Panda, Oreial swimsuits, stuffed toys, diamonds

Lisa:
Ruby, Cherry Pie, Research Book