Infinite Crystals
At the Title screen, hold L1 and press Square, Square, Circle, Down, Left, Right, Left, Right. Start a game, hold R2 and press Square to add 100 crystals. Repeat as much as necessary.

Cheat mode
Hold L1 and press Triangle, Left, Left, Right, Square, Up, Up, Left, Circle at the title screen. Then while playing a game, press L2 + R2 to display a cheat menu.

Infinite lives
Hold L1 and press Circle, Down, Left, Up, Right, Triangle, Down at the title screen.

Shortcut In Water Race In World 1
There is a shortcutin the Water Race. When you get to the waterfall go through it and you will be on the other side of the river.

100 crystals, 1st level
On the first level, straight away go across to the trapoline, and do a triple jump on it and you'll instantly get 100 Crystals.