Cheat
In warp room 2 jump repeatly on the cub and you will get ten lives.

Revisit Bosses
Jump on the platform in the middle of any warp room. Hold L1 L2 R1 R2 and triangle and when crash points upwards press up.

Note: Only bosses that have been defeated may be revisited.
Codes
Blue Gem - Beat Turtle woods with no boxes
Yellow Gem - Beat the timer in Plant Food
Pink Gem - Go on the Nitro staircase in Bee-havin'
Red Gem - In Air Crash don't jump on the first jetboard jump on the boxes until you land on a platform.
Green Gem - Go to the end of the Nitro room in The Eel Deal.

Level select
Press circle + square + R1 in the middle of the warp room.

Hidden Warps
In Bear Down go all the way to the end of the level and when the little bear drops you off go on the ice float in the middle of the water.

In Unbearable, when the bear drops you off, do a high jump in order to get to the other side of the big hole. And keep on going back until you see the bear again.

Hidden Level In Turtle Woods
Go to turtle woods in tthe first warp room. When your done with the bonus you'll notice that an octagon with a menacing face drawn on it on the floor.Do the body slam on it and it will take you to a new level.

Extra Shield
When Crash dies, press Up and Circle when he reappears he will be equipped with a mask.

Bonus Lives
In second warp room jump on the baby polar bear's head ten times for ten lives.

Extra time
In the level plantfood there is an easier way to beat the timer and get the gem. when the timer starts, keep going until you get to the bonus level platform. jump on and when you get to the bonus level, jump over the edge. since its the bonus level, you will not lose a life. when you return standing next to the platform, you should have about 1 minute and 43 seconds added to your timer.NOTE:if you die on your way to the end of the level, the timer will stop and you will have to re-enter the level for it to start again.