Ice Age 2: The Meltdown Infinite health
Pause the game and press Up, Right, Down, Up, Left, Down, Right, Left.
Infinite energy
Pause the game and press Down, Left, Right, Down(2), Right, Left, Down.
Infinite pebbles
Pause the game and press Down(2), Left, Up(2), Right, Up, Down.
The image featured at the top of this post is ©Square Enix.