Hydro Thunder

All boats and tracks:
Get one of the top five times in any track and enter ?DL as a name. Note: Enter ?PB as a name in the European version of the game.

Fishing boat:
Enable all hidden tracks. Highlight the Thresher at the boat selection screen. Then, hold L + R and press Y(2). Select the Chumdinger to race in a fishing boat.
Information in this section was contributed by WILLIAM BLAKELEY.

Tinytanic boat:
The Tinytanic boat can be unlocked by completing the Catacomb level. All bonus boats are unlocked by getting first place in each bonus track.
Information in this section was contributed by MICHAEL SHIELDS.

No timer:
Press X + Y + B + Start at the main menu.

Quick start:
Note: This trick assumes the game is under the default controller setting. Hold L before the race begins. When the number "3" appears release L and hold R. When the number "2" appears, release R and hold L again. When the number "1" appears, release L and hold R. This should result in a start with a four second boost. Adjust your timing to when the numbers begin fading before switching buttons if you do not get the boosted start.
Information in this section was contributed by Shard Falcors and Steven Elliott.

Boosted jump:
Collect boost power-ups, then hold L and press A to jump without a ramp.

Full pause screen:
Pause game play and press X + Y to remove the text from the screen.

Medium difficulty tracks and boats:
Successfully complete all three easy difficulty tracks in first, second, or third place.

Hard difficulty tracks and boats:
Successfully complete all medium difficulty tracks in first or second place.

Bonus tracks and boats:
Successfully complete all medium difficulty tracks in first place to unlock the Nile Adventure bonus track. Successfully complete this track in first place to unlock the next bonus track. A total of four bonus tracks can be unlocked by finishing in first place. All four bonus boats (Fishing Boat, Armed Response, Blowfish, and Tinytanic) will be available after all four bonus tracks are unlocked.
Information in this section was contributed by Jason Fabisch.

Select two player mode and on the first three tracks medium boats and tracks will appear: Race on the three tracks and hard boats and tracks will appear. Race on all three tracks and the Nile track will appear. Race on the Nile and three other bonus tracks and all boats, including the fishing and tour boats will be unlocked. Keep playing in two player mode to always finish in first place.
Information in this section was contributed by Sishamaels.

Hint: Arctic Circle: Shortcut:
Near the beginning of the level are some houses. There is a house where you can only see the roof. Jump off the roof and you should jump up about three or four places ahead.
Information in this section was contributed by Matt Elder.

Hint: Arctic Circle: Secret area:
When you reach the area with the big oil tanker and penguins, jump over into a secret area with a red boost.

Hint: Catacomb: 9 second boost:
At beginning of the race there are two columns. Go between them and you will get a 9 second boost.

Hint: Far East: Shortcut:
When you are about half way through the level you will reach a place where the water will drop three times. Just when your on the third one, immediately do your booster jump when you get on the edge. When your boat jumps in the air, hold Boost. If done correctly, you should land on top of a place above the tunnel ahead. This will make it much faster than having to go in a big "L". Note: This requires some practice.
Information in this section was contributed by Ellen4uofm.

Hint: Far East: Boost:
When you pass the first dragon shortly before the finish line, make sure you have some boost remaining for the little island holding the second dragon. If you boost/jump through the lanterns on the island, you will get extra boost. You can get an eight second boost if you hit both lanterns precisely.
Information in this section was contributed by Timothy Ladouceur.

Hint: Lake Powell: Shortcut:
Near the end of the level there are two gaps and a cement ramp-like wall separating them. Use your booster and go up the ramp. You should land on the train tracks and get a 9 second boost.
Information in this section was contributed by Ellen4uofm.

Hint: Lost Island: Shortcut:
Go through the waterfall at the beginning of the level. You will get a red and blue boost, fall out a small fall, and immediately find a small village. At the end of the village, before the slight turn, go towards the left side. You will find a cave. Go through it and get the red boost, then a blue. You will exit the cave and be above the track. You will get another blue boost and a final red boost.
Information in this section was contributed by Matt Elder.

This level has three shortcuts. At the start, go through the waterfall then turn to the left. Before you go through the tunnel, do a Hydrojump. This will take you to a secret area. If you miss it, you can also go up the other waterfall but you will take damage. You can then go through the volcano, but use a turbo off of the ramp to get an invisible 9 second boost.
Information in this section was contributed by Drew.

Hint: New York Disaster: Shortcut:
Near the beginning is a silver revolving door that appears to be solid. Go through it and you will find a blue boost and a red boost. To get the red boost you have to use a Hydro Jump (hold Brake and use Boost).
Information in this section was contributed by Matt Elder.

Just after the start when you enter the first tunnel, you will see a checkered pattern on the left wall (just before exiting the tunnel). This is a shortcut that will bring you to where the revolving door would, and will take you five or so places further into the pack.
Information in this section was contributed by Timothy Ladouceur.

Hint: New York Disaster: Boost
In NY Disaster, when you are racing through the left side of the subway tunnel with the Rescue boat cutting you off and bumping into you, instead of jumping for the nine second red boost in the center to the right, bash into the Rescue boat. Your boost level will remain where it was for the remainder of the race.
Information in this section was contributed by kmcgee.

Hint: Recommended boats:
The following is a list of the best boats to use on the easy and medium tracks.
Information in this section was contributed by Mike Attaway.

Thunder Park track: Damn the Torpedoes
Lost Island track: Midway
Arctic Circle track: Damn the Torpedoes
Greek Isles track: Midway
Lake Powell track: Thresher
The Far East track: Thresher or Midway