Collect all the Die-O-Ramas to unlock the Baby Crash costume.
Chicken heads
Hold L + R and press A, B(2), X at the main menu.
Disable HUD
Hold L + R and press A, X, Y, B at the main menu.
Easy coins
Drink a Whumpa Whip and let a Ninja Penguin attack you. Then, pick up your coins.
Evil Crash Costume
When you find Cortex on Mystery Island there's an owl shaped lamp behind him. Hit the body-slam switch and it will rise up. Enter the cave, and go right. Have a chat with thethe drone at the top of the island and shell out 2000 coins to get the costume.
High speed mode
Hold L + R and press B(2), Y(2) at the main menu.
Japanese Crash
Hold L + R and press X, B, X, B at the main menu.
One hit knock outs
Hold L + R and press A, B(2), A at the main menu.
Play as Crunch Bandicoot
Give Cruch Bandicoot 2,500 Coins at Midway to unlock him.
Play as N. Gin
Give N. Gin the Green Plutonium at Midway to unlock him.
Play as Nina Cortex
Giver Nina Cortex the keys at Midway to unlock her.
Play as Pasadena Opossum
Give Pasadena Opossum one Power Crystal at Midway to unlock him.
Play as Von Clutch
Give Von Clutch one Power Crystal at Midway to unlock him.
Skeleton Crash costume
Talk to the Astro Land worker near the stunt arena to get the Skeleton Crash costume for 4,000 Coins.
Third tier kart weapons
Spend one Power Crystal at Midway to buy the following character's third tier kart weapon from them: Coco, Crash, Crunch, N. Cortex, N. Gin, Nina, Pasadena, and Von Clutch.