Huge Balls:

Pause the game and press Left, A, Right, Down, B, A, Left, Left. 

Infinite Time:

For unlimited time, pause the game and press B, A, Left, Left, B, 
Left, A, B, Left, A, B, Left, A. 

Smaller Balls:
Pause the game and press A, B, Left, Left, Right, A, Down, A, Right, 
Left, Up, Left, Up. 

Translucent Balls:

Pause the game and press B, A, Left, Left, B, Left, Up, Right, B, A, 
Left, Left. 

Turn Opponent Black-and-White:

Pause the game and press B, A, Left, Left, B, Left, A, C, B, A, Left, 
Left, Up. 

Turn Self Black-and-White:

Pause the game and press B, A, Left, Left, Down, Right, A, B, B, A, 
Left, Left.