Dragon Ball: Advance Adventure Cheats

Cheat mode:
Press L, R, Up, Down, L, R, Left, Right, R(2), Right at the title screen to unlock a fourth mini-game, all bonus characters, and extras,

Boss mode:
Finish the game with Goku and Krillin.

Extra mode:
Finish story mode with Goku.

Survival in free battle mode:
Finish story mode with Goku.

Rock breaking and Korin's Tower mini-games:
Finish the game with Goku.

Small Fry Fight mini game:
By collecting all the Dragonballs in extra mode you will unlock the Small Fry Fight mini game. If you collected enemy portraits in extra mode, you will also be able to use those characters in the Small Fry Fight mini game.
User Cheat by Mack342

King Piccolo:
Finish the game with Goku.

Krillin:
Finish the game with with Goku

Piccolo:
Finish the game with Krillin.

SSJ1 Goku:
Go to Roshi and talk, then steal Baba's ball and take it to Korin. At the end of the game sequence, Goku will transform into SSJ1, after which the credits will start. You will be allowed to play a New Game +, in which you can use SSJ1 Goku. This will allow you to play through to Freiza.

Cyborg Taopaipai in tournament mode:
Defeat Cyborg Taopaipai in the last level of tournament mode.

Juckie Chun in tournament mode:
Defeat Juckie Chun as Goku in story mode.

Piccolo in tournament mode:
Finish the game as Krillin.

Son Gohan in tournament mode:
Defeat Son Gohan as Goku in story mode.

Taopaipai in tournament mode:
Defeat Taopaipai as Goku in story mode

Tenshinhan for tournament mode:
Defeat Tenshinhan as Goku in story mode.

Bonus free battle mode characters:
Defeat Juckie Chun, Taopaipai, Son Gohan, and Tenshinhan in the story mode free battles to unlock the corresponding character in free battle mode. Defeat Cyber Taopaipai in survival mode after unlocking Piccolo to unlock Cyber Taopaipai in free battle mode. After finishing the game with Gokou and Klylin you will unlock Piccolo in free battle mode.

Sound test:
Finish Boss Rush mode to unlock the sound test selection at the options menu.

How to beat Pilaf the second time:
When you face Pilaf the second time (in the level after The Red Ribbon Army Base level), just make sure he is on one side. Then, jump and hit him several times. Jump again and hit him several times. Keep doing that on the spot. He may hit you sometimes, but not enough to kill you. If the bombs explode on you, just get up and carry on until he dies. This is a guaranteed simple way to win.
User Cheat by JackShort324

Opening red doors:
In order to open the red doors you must successfully complete the story mode with Goku, which will unlock Extra mode. Once you play in Extra mode, all the red doors will be open.