All Working Tony Hawk's Pro Skater 3 Cheats - GameBoy Color

Completion bonus
Successfully complete the game with all starting characters to unlock the Skate Heaven level and Private Carrera as a bonus skater.

Airport: Startle security
Do a grind on all of security trucks.

Airport: Hidden tape
Go up the ramp at the beginning (not the one behind you), turn up once, and jump over it. There should be a rail. Grind it until you see the tape above you. Then, do a long grind and a 360 Ollie off the rail.

Canada: Hidden tape
When you start, summon the ships. Then at the place where you start, instead of going forward, go backwards and the ships should be there. Jump and get in the first ship, then jump the ramp and get to the second one. At the end of the second ship should be a quarterpipe. Get on top of it and try to jump and do a grind on the rail. Then, jump to the second rail and the tape should be there.

Foundry: Light the furnace
Go to the end of the ramp and go right. Turn right again on the second ramp. Head for the ramp and go to the top. When you get there, turn around and grind the three rails (remember to jump in between the rails). Get to the platform and grind the little lever to light the furnace.

Los Angeles: Hidden tape
After you bring on the quake, go to the side of the bottom lane where there is a big quarter pipe. Press [A] + [Left] at the top to jump over to the other side. Then, go over until you see a broken ledge. Grind on it, then jump up to a platform. Go all the way over to the right to find the hidden tape.

Rio: Bring on the music
Grind on all of the speakers

Suburbia: Hidden tape
Go to where you found the "A" in "SKATE" and get off the ramp to the right. Go until you hit the side of the house quarterpipe and repeatedly press [A] until you get to the top. Then, get the tape and jump off.