Milo's Astro Lanes 

White Dwarf Ball 
During your character's turn to bowl:
press Right(3), Left(3) to throw an extra heavy ball.
If you entered the code correctly, you will hear a sound.

Mega Ball 
During your character's turn to bowl:
press Left(2), Right(2), Left, Right to throw a giant ball.
If you entered the code correctly, you will hear a sound.

Booster Ball 
During your character's turn to bowl:
press Right(2), Left(2), Right, Left for a extra forward push.
If you entered the code correctly, you will hear a sound.

Clone Ball 
During your character's turn to bowl:
press Left(3), Right(3) to throw three balls instead of one.
If you entered the code correctly, you will hear a sound.

Green screen 
During your character's turn to bowl:
press Right, Left, Right, Left(2), Right. 
If you entered the code correctly, you will hear a sound.