Crash Nitro Kart cheats and cheat codes for Gamecube

Unlock playable characters:
Dingodile:  Find one Red Gem 
Fake Crash: Get over 50 boosts on a track as Team Cortex in adventure mode. 
N. Trophy: Defeat all N. Trophy ghost racers in time trial mode. 
Polar: Find one Blue Gem 
Pura: Get over 50 boosts on any track as Team Bandicoot in adventure mode. 
Real Velo: Find two Scepters. 
Zam: Find one Purple Gem 
Zem: Find one Green Gem 

Unlock Movie sequences in Extras option:
Complete the following tasks bellow:

Team Bandicoot
Challenging Krunk: Earn 3 trophies.
Krunk Loses: Have 1 key.
Challenging Nash: Earn 6 trophies.
Nash Loses: Have 2 keys.
Challenging Norm: Earn nine trophies.
Norm Loses: Have 3 keys.
Challenging Geary: Earn 12 trophies.
Geary Loses: Have 4 keys.
Challenging Velo: Have 4 keys.
Losing to Velo: Have 4 keys.
Defeat Velo without 100%: Have 4 keys.
Defeat Velo with 100%: Have 4 keys, 13 Relics, and 1 Scepter. 

Team Cortex
Challenging Krunk: Earn 3 trophies.
Krunk Loses: Have 1 key.
Challenging Nash: Earn 6 trophies.
Nash Loses: Have 2 keys.
Challenging Norm: Earn 9 trophies.
Norm Loses: Have 3 keys.
Challenging Geary: Earn 12 trophies.
Geary Loses: Have 4 keys.
Challenging Velo: Have 4 keys.
Losing to Velo: Have 4 keys.
Defeat Velo without 100 %: Have 4 keys.
Defeat Velo with 100 %: Have 4 keys, have 13 relics, and 1 Scepter. 

Bonus Arenas - Terra Drome: 
Find all purple tokens in Adventure Mode races.  

Hyper Spaceway track:
Play in adventure mode and finish in 1st place in all 16 races 
(4 boss race, 12 normal race).