Paperboy

Big Jump Springs: Enter "ALLJUMP"
Big jump: Enter "MOON"
Cartoon sounds: Enter "THUMP" or "THUNK"
Enable slow motion mode: Enter "WAKING"
Enable turbo mode: Enter "RUSH"
Giant newspapers: Enter "SUNDAY"
Unlimited papers on every stage: Enter "NOBUNDLE"
Invincibility: Enter "INVINC"
Invisible barrier: Enter "JUMBLE"
Near-sighted mode: Enter "MAGOO"
Random paper tossing: Enter "RANDOM"
Rocket Boosters: Enter "GOFAST"
Screaming barrier: Enter "SCREAM"
Throw papers at 90 degree angle: Enter "SIDES"
Throw papers back: Enter "BACKWARD"
Throw papers directly in front of character: Enter "FRONTS"
Tiny paperboy: Enter "LITTLE"
View all headlines: Enter "HEADLINE"
Jump to next frame: Enter "UNTIMED" - During gameplay, hit C-Right to jump.

Stage select:
Enter "MAXSUBS" or "OBVIOUS" code and go to the Alice's RV Haven stage.
You will see the game will mark the stage as finished. When you leave
the stage you will unlock all of remaining stages.