Flip tricks 
Kickflip B + R 100 
Popshuvit Up + R 100 
Heelflip A + R 100 
Shove it Down + R 100 
Inward Heelflip Up + A + R 420 
Varial Heelflip Down + A + R 360 
Varial Kickflip Down + B + R 360 
Hardflip Up + B + R 360 
360 Shove It Up(2), L Unknown 
360 Flip Down(2), L Unknown 

Grab tricks 
Melon B + L Varies; 150+ 
Nosegrab Up + L Varies; 150+ 
Indy A + L Varies; 150+ 
Tailgrab Down + L Varies; 150+ 
Mute Up + A + L Varies; 175+ 
Roastbeef Down + A + L Varies; 150+ 
Benihana Down + B + L Varies; 300+ 
Crossbone Up + B + L Varies; 175+ 
Ollie North (Tony. Hawk) Up(2), R Unknown 
Sal Flip (Steve Caballero) Up(2), R Unknown 
Airwalk (Tony Hawk and Steve Caballero) Down(2), R Unknown 

Grinds and Slides 
Tail-slide B + A Varies; 30+ 
Nose-grind Up + A Varies; 30+ 
Nose-slide A + A Varies; 30+ 
5-0 Down + A Varies; 30+ 
Crooked Up + A + A Varies; 30+ 
Feeble Down + A + A Varies; 30+ 
Smith Down + B + A Varies; 30+ 
Overcrook Up + B + A Varies; 30+ 
50-50 Straight + A Varies; 30+ 
Nose Blunt Slide Up(2), A Unknown 
Blunt Slide Down(2), A Unknown 

Plants 
Disaster B + A Up to 6486 
Hand-plant Up + A Up to 6245 
Egg-plant A + A Up to 6730 
Rock 'n Roll Down + A Up to 5716 

Miscellaneous 
Boneless B + Up + Up 300 
No comply B + Up 240 
Manual Up + Down Varies; 100+ 
Nose-manual Down + Up Varies; 100+ 
Ollie B 0 
Fakie ollie Switch + L + B 240 
Nollie L + B 200 
Turn or spin in the air Left or Right Varies; 75+ 

Miscellaneous tricks:-  Wallride: Ollie (B) while close and parallel to a wall, then press A.

Wallie: Press B while wallriding. 

Bonus characters:-  Get all the stats to full for Tony Hawk, complete all goals, and get all gold medals to unlock Mindy and Spider-man. 

Pool secret area:-  Go to career or free skate mode. Free skate can help you practice. Select the player with the best ollie ability. If you have money, add more points to the boarder's stats. In level select, choose "School II". Skate directly down to the picnic tables. When you are there, skate down and along the wall at the bottom of your screen. Go up the wooden ramp onto the school building. Kickflip onto the next building, then stop. There should be a rail on the roof. You have to grind more than half the rail in order for this to work. A "Open Sez Tc" sign will appear. Go back near the picnic tables. Go through the arrow and into the gym. There is $150 in there. There is a $100 bill on the high dive in the secret pool area. 

Wind-tunnel secret area:-  Grind the propeller on the half-pipe to unlock the "wind-tunnel". It is on the other side of the park and  contains the secret tape and some money.

Hints: 

Easier specials:-  If you cannot remember your character's specials, or want an easier combination of buttons to press, go to "Edit Tricks" after you select your character. You can change you special moves to different button combinations.

Reveal specials:-  If you do not know a characters specials, go to "Edit Tricks" after you select your character. You can see what the specials are set to.

900+ trick:-  This works with most skaters when you do not boost up their stats. Be prepared to do a trick when you go up a vert ramp. When you get up off the ramp, do the trick and immediately press the way you want to rotate ten times. If done correctly, you will do a 900 plus any trick you did. Note: With tricks that contain Up/Left, and Up/Right, you can do a 1080 if you are lucky. When you do this on the Going Down Town gap, you can get a 1260.

Easy Sick score:-  Enter the options menu and enable "Kid Mode". Enable the master code to unlock the cheat menu, then enable "Perfect Balance". Start the first level and go over to the halfpipe. When you are about to fly into the air, press A + Up, Down,  Left, or Right to do a trick that will give you a lot of points. Only hold it for a few seconds or else you will fall and not get all of those points. When you only have about a minute left, go over to the far side of the halfpipe and onto the edge of the screen. Then, do a grind to the left side and do not press anything. You will go around the level area and will fall off at the starting ramp. You should have about 20 seconds remaining. Do it again. By the time you reach the starting ramp again, time should have run out and you should have a very large score.

Unlimited tricks:-  Enable the "Flight mode" code. While flying, you can do tricks and spin past 900 degrees. You can also do unlimited tricks while flying.

Rodney Mullen: Freestylin':-  Do a Casper To 360 Flip and jump. Land on another Casper To 360 Flip and press Down, Up, Right, Left, Right, Up, Down and so on. You will do a trick called Freestylin'.

Rooftops Boston: Jumping around:-  Enable the "Level select" and "Maximum money" codes. The Rooftops Boston level will be unlocked. You can go from roof to roof by jumping or using the "Flight mode" code. Note: Do not go off the edge or you will restart. 

New York: Flying body:-  Go to the New York level and enable the "Flight mode" code. When you start the level there is a curb along the street to your right. Grind the curb and fall in the direction of the street. Hold B as you tilt and fall to become an upside down hovering body. You can now fly around by pressing A and B, as you would normally with the flight mode code. If you touch the ground you will get your skateboard back. 

Glitch: School: Unlimited tricks in one jump: There is a double rail on a hill in this level. Go to that rail and do the "Kiss The Rail" move. Your character will get stuck, a big drop sign will appear, and the screen will wobble back and forth. You can do unlimited tricks while you wobble. Note: You cannot continue unless you turn off the game.

Glitch: Warehouse: Unlimited tricks:-  You can also get stuck on the helicopter with a Big Drop Sign. You can do unlimited tricks here, however you must turn off the game when done.

Super passwords: 

Enter CZWWVW FMKCVB as a password to unlock the Football and Shadow board for Bob Burnquist, $2750, and have some of the objectives in each level completed.
Enter CJFBV3 KTKC2B as a password to have all three of Bob Burnquist's boards, some of the objectives in each level completed, $540, and The Bullring unlocked.
Enter V!T!MB BBBBVV as a password for $50,000 with Tony Hawk, but no objectives completed.
Enter B58LPT GBBBBV as a password for all the boards, levels and a few objectives completed with Tony Hawk.
Enter BTO7ZT PTTBBV as a password you will have all three stages (paid), all three boards (paid) and $69,910 for Tony Hawk. 
Enter B8SD2! !!!!T! as a password for all objectives completed as Tony Hawk.
Enter VTPMPS BBBBVV as a password to get glitched money, all parks, and the Falcon board.
Enter VTO!3T T!TZT1 as a password for $80,150, all boards, and all levels for Tony Hawk.
Enter 75FV2? P!PZ5J as a password to get all levels and a new board for Elissa Streamer.
Enter 01BB28 PTPFC2 as a password to get all levels for Rune Glifberg
Enter 225B2? T!PZ72 as a password to get all levels and a new board for Bucky Lasek.
Enter BTT!3TT!!Z!! as a password to get all money, boards, stages, and objectives, except three of them, with Tony Hawk. 

New York City: Extra points:
In New York City, take a right where you see the railing. When you see the railing across the street, jump on it. Everytime Jump and do a Method or Judo to get over 9000 points on one run. 

Turn immediately to the right and go to the end. Just before all the flower beds, jump on the railing (above the ramp downwards). Then, jump on it, do two Melons, Judos, Methods etc., and keep jumping between all the railings -- there should be about four to five. You can get up to 65355 points.