Splashdown

Note: This is the original game in the series, and not the sequel, Splashdown: Rides Gone Wild.

Cheat mode:
Select "Options" at the main menu. Hold R2 and quickly press Up(2), Down(2), Left, Right, Left, Right, Square, Circle, Square, Circle at the options menu. The Cheat Name screen will appear to confirm correct code entry. Enter one of the following case-sensitive codes then press X to exit back to the options screen. You can now continue your game and see the effects of the cheat.
KrazayKarl and mareescott.

After entering one of the following codes, the sound of a Sea-Doo engine will confirm correct code entry. If you hear the sound played when you miss a buoy, the code was entered incorrectly.
Blake Hulton.

Cannot get knocked off:
Enter TopBird as a case-sensitive code. The CPU can no longer knock you off your SeaDoo, but you can still knock them off.
KrazayKarl and mareescott.

Hard tracks with normal AI settings:
Enter Hobble as a case-sensitive code.
KrazayKarl and mareescott.

Maximum performance meter:
Enter PMeterGo as a case-sensitive code. Note: If you miss a buoy you will stall with this code on.
KrazayKarl and mareescott.

All courses:
Enter Passport as a case-sensitive code. Note: This also unlocks Steve. Note: This also unlocks the Bermuda Triangle.
mareescott.

All characters:
Enter AllChar as a case-sensitive code. Note: This also unlocks Steve.
KrazayKarl and mareescott.

All wetsuits, courses and characters:
Ente LaPinata as a case-sensitive code.
mareescott.

Expert AI:
Ehter AllOutAI as a case-sensitive code. The AI will run the best race possible on all courses. Note: This is already active by default under the hard difficulty setting.
KrazayKarl and mareescott.

All ending FMV sequences:
Enter Festival as a case-sensitive code.
KrazayKarl and mareescott.

Play Time Trials against a UFO:
Enter IBelieve as a case-sensitive code.
KrazayKarl and mareescott.

Play Time Trials against a miniature F-18 jet:
Enter F18 as a case-sensitive code.
KrazayKarl and mareescott.

Play Time Trials against ghost of currently selected player:
Enter SEADOO as a case-sensitive code. Note: this is the default in the game.
KrazayKarl and mareescott.

Ending bonus:
Successfully complete the game under the hard difficulty setting to unlock Steve as a playable character and the Bermuda Triangle level.
combasew.

Hidden track:
Collect 100 balloons in countdown mode.

Hint: See squid:
You can see the squid by turning right off the track immediately at the very start in freestyle mode. If you go out far enough, the squid will take you under and blast you back onto the track.
Chrisfoxinsocks1.

Play the Loch Ness track in career mode. When you reach the waterfall, hold down the nose of your jet ski so that you submerge. You will pop up in a cave on the other side of the waterfall. Once you reach the start of the course on the next lap, the squid will be waiting there.
derek.

Immediately at the start of any race (free ride mode recommended), go straight off the course and enter open water. The music will stop and the squid will grab you and throw you somewhere on the track.
Bball41Sball20.

Hint: Easy performance meter gain:
For an easy performance meter gain, pick up speed in an open area. Then, slam the Left Analog-stick Up hard to duck under. Then slam the Left Analog-stick Down and hold it to perform an invert.
Gary Mana.

Hint: Hold tricks longer:
Before going off of a ramp on your SEADOO, hold the shoulder button(s) that are required to do that trick. Just when you get it the air, then press the D-pad to do your trick. Note: You do not need to hold the D-pad, but you do need to hold the shoulder button(s) to hold your trick. If you want to go farther in the air, hold Down on a straight-away. This pulls your SEADOO's nose out of the water, making it go faster. However, your steering is highly diminished.
John.

Hint: Moves:
dr.

Level 1
Cordova: Press L2 + Up.
Lazy Boy: Press L2 + Down.
Heart Attack: Press L2 + Left.
Double Cancan: Press L2 + Right.
Spade: Press R1 + Up.
Rollover: Press R1 + Down.
Saran Wrap: Press R1 + Left.
Seat Surf: Press R1 + Right.
Handlebar Handstand: Press R2 + Up.
Superman: Press R2 + Down.
Nac Nac: Press R2 + Left.
Shin Grab: Press R2 + Right.

Level 2.
Air Walk: Press L2 + Up, Down, Up.
Cliffhanger: Press R2 + Down, Up, Down.
Rack: Press R2 + Up, Up, Down.
Whirlybird: Press R2 then rotate the Left Analog-stick counter-clockwise in a full circle starting at Up.
Metronome: Press R2 then rotate the Left Analog-stick counter-clockwise in a half circle starting at Left.
Roundhouse: Press R1 then rotate the Left Analog-stick counter-clockwise in a half circle starting at Right.
Tumbleweed: Press R1 + Down then rotate the Left Analog-stick counter-clockwise in a half circle starting at Up.
Doubledouble Cancan: Press R2 + Right, Left, Right.
Rear Handstand: Hold R1 + R2 and press Down, Up, Down.
Bicycle Kick: Press R2 + Right then rotate the Left Analog-stick counter-clockwise in a half circle starting at Left.
Kiss Of Death: Hold R1 + R2 then press Up, Down, Up.

Level 3.
Backflip Hold R1 + R2 and press Down(2).
Pommel Horse: Press R1 + Right, Left, then rotate the Left Analog-stick counter-clockwise in a full circle starting at Down.
Wu Ping Crane: Press R2 + Up, Down, then rotate the Left Analog-stick counter-clockwise in a full circle starting at Up.