Cheat codes:
To enter the cheat codes, select "Options" from the main menu, then select the "Secret Codes" option. Select "New Code", then use the "Type-Matic" to enter one of the following codes:

UNTIMED - Single frame advance with C right.
HEADLINE - View all Newspaper headlines.
NOBUNDLE - Have unlimited papers all levels.
INVINC -Inf Health
JUMBLE - Run into Invisible objects
SCREAM - Everything you hit emits scream
MOON - Jump super high in air
WAKING - Slo motion
RUSH - Turbo mode, clock too.
ALLJUMP - Always have Super Jump Springs
GOFAST - Always have Rocker Boosters
BACKWARD - papers get thrown backwards
LITTLE - Paperboy is super tiny
MAGOO - Near sighted paperboy, only see short distance if front of you.
SUNDAY - HUGE newspapers.
MAXSUBS or OBVIOUS - Level select.
RANDOM - Random paper tossing.
FRONTS - Throw papers directly in front of character.
SIDES - Throw papers at 90 degree angle.
THUMP or THUNK - Cartoon sounds .

How To Get Extra Papers:
To get the extra papers on boss battles, you just have to press the L and Z buttons repeatedly while the camera is adjusting, right before the battle starts.