At the options menu, press Start Z X to unlock a "Password" option. Use this option to enter passwords to compete in official time attack challenges.
Lost Temple Lagoon time attack track
Enter "LQ3TRKTE" as a password to unlock this track under time attack mode. In the Japanese version of the game, enter "J784WMHF" as a password.
Southern Island stunt track
Enter "WCX5WP5A" as a password to unlock this track under stunt mode. It is possible to do a Double Backflip on this track. Immediately press A when the light turns green and use your turbo just before the ramp starts. Note: This trick is very hard to accomplish.
Ethnic Lagoon Time Attack Japanese Version
At the Options Menu press X Z Start to enter passwords. Now enter J784WMHF.
La Razza Canal Time Attack Track
At the Options Menu press X Z Start to enter passwords. Now enter MJV8LKL6.
Dolphin Park Stunt Track
At the Options Menu press X Z Start to enter passwords. Now enter 463YWNX3.
Ride a Dolphin
At the Options Menu press X Z Start to enter passwords. Now enter DLPHNMOD.
Expert Championship tournament
Enter "AJXY8P53" as a password to unlock a expert championship tournament on seven tracks.
Alternate costume colors
At the character selection screen, highlight a character and press Z to display a screen where you can alternate their costume color and more.
Control loading screen
While a track loads, press the Left Analog-stick to control the water.
Control title screen
When "Start" appears on the title screen, press the Left Analog-stick to move it on the water.
Use the Right Analog-stick during a replay to control the view. Press Right Analog-stick Up to change camera angles. Press Right Analog-stick Right to pan the camera around your character. Press Right Analog-stick Down to bring the view to water level. Press Right Analog-stick Left to switch to a first person view.
While playing a game, hold X B Start.
Arctic Bay track
Successfully complete championship mode on the normal difficulty setting to unlock the Arctic Bay track. Note: This track is named Cool Ocean in the Japanese version of the game.
La Razza Canal track
Successfully complete championship mode on the advanced difficulty setting to unlock the La Razza Canal track. Note: This track is named Aqua Maze in the Japanese version of the game.
Strongwater Keep track
Successfully complete championship mode on the expert difficulty setting to unlock the Strongwater Keep track. Note: This track is named Victory Gate in the Japanese version of the game.
Successfully complete the expert championship in first, second, or third place to respectively unlock the weather conditions in time trial mode under the expert, hard, or normal difficulties.
Enter training mode and complete all training objectives under the beginner and master settings to unlock a "Try" option under training mode. This mode is a stunt variation of Dolphin Park.
At the start of a race, press A right before the announcer says "Go" and the light turns green to get a quick start and a turbo.
Hidden area in Dolphin Park
In free roam mode, aim for the island in the background when you first start. Just before you hit the "out of bounds" markers, hit the turbo. If done correctly, you will see a second area. Head for that area and when you can hit the turbo a second time, do so to reach it. This may require more than one attempt. This new area has monster waves that you can do any trick on.
Shortcut in Arctic Bay
After passing three icebergs and the long right turn, before the ramp, at around 2 o'clock you will se a discoloration in the mountain side. Run into that discoloration and it will open up the underground penguin lair. Bear right and you will see a reunion with all the penguins and a ramp. There are two shortcut options. Either go onto that ramp and dive, which uncovers one shortcut; or go straight, which uncovers a different shortcut.
Shortcut in Lost Temple Lagoon
Towards the end of the track, as you are on the big turn, is a big brick wall. Run into the wall with your Jet Ski and it will break, giving you an advantage on the race. You can do this in any game mode.
Shortcut in Ocean City Harbor
After the third jump ramp, immediately before the fourth jump make a sharp right so that you can see a red gate guarding a tunnel. Go through the gate, which opens a very nice shortcut.