Codes
Skip to any level

At any time, hit start to pause the game. While paused, hitdown to raise the number of the level you're in by one. Hit up to lower it by one. When the desired level is chosen, unpause, and you'll be sent to that level.


Passwords
Skip to various levels

At the title screen, go to game setup and hit start. At the bottom of the list of options, you can enter passwords. That's where you enter the following:
Password                Effect
QQXRB                   Start game at level 11.
W26RJ                   Start game at level 16.
DSZDD                   Start game at level 21.
LKSX5                   Start game at level 26.
D1H4R                   Start game at level 31.
D1BTP                   Start game at level 36.
R53HR                   Start game at level 41.
BQYSZ                   Start game at level 46.
4KLX8                   Start game at level 51.
8WNPY                   Start game at level 56.
FFGMS                   Start game at level 6.
DXXLG                   Start game at level 61.
1V4J4                   Start game at level 66.
LF2LK                   Start game at level 71.
JSDJY                   Start game at level 76.
CWSPU                   Start game at level 81.
TLZ5H                   Start game at level 86.
1NY1H                   Start game at level 91.
JZRUT                   Start game at level 96.