LEVEL SKIP CHEAT: 

In any game, press and hold the following buttons: L1, R1, Diagonal Up-Left
on the D-pad, Triangle, Circle, Start, and Select.  If done correctly, you
will hear a loud grinding noise.  Let go of the buttons and immediately
press and hold the following buttons: L2, R1, X, Triangle, and Down on the
D-pad.  You should hear a word spoken if done correctly.  Now, anytime you
wish to advance a level, simply press L1, L2, R1, and R2 at the same time.
After pressing those 4 buttons, you will advance to the next level as soon
as there are NO enemies on the web.  The easiest way to do this is at the
very beginning of the level before an enemy appears on the web, or press
the top 4 buttons and then use a Superzapper.

(Joe Cecchin) 

HIDDEN GAMES:
hi if you get 500000 points you can enter a comment on the high score table...
try "yiff!" this will activate the tempest 2000 hide
games as seen on my beloved atari jaguar !

(Steve Gilbert)

Wanna know how to get to the hidden version of Minter's game on the PSX
disc? Easy! When you get a first-place high-score, just enter "H V S" or
"YIFF!" as your name. Now, look at the main menu and BINGO! Once you
save the game to the memory card, you will always have these options
in the future, and yes -- you can go ahead and enter a different
high-score in the future... the game just knows!

Some of you have asked about Trippy mode too -- don't want to give away
ALL of the secrets, but here's how to manage that one: simultaneously
squeeze L1, up, left, select and mirror this on the right of the
controller with R1, up button, right button and start. That's the Vulcan
Death Pinch.
You'll hear a horrible grinding noise, but that's to be desired! Now,
let go of the pad and squeeze up button, down button, R1, L2 and tap
"up" once.
This works from anywhere, so you can even see a melty title-screen if
you want (looks cool)!

(Kent Frechette)