In the display, they said that this game has 30 secret rooms to find.

So far, I've only found a few.
What's New
-Added Secret Room in Stage 2, scene 3
-Added Secret Room in Stage 3, scene 1
-Description of some secret stages

Mission 1, Scene 1: Bachelor Pad
After the section with the boat, hit the three square white cans. Two near the middle of the screen in front of the brown crate and one in the lower right corner.

Mission 1, Scene 2: Sharks
I'm not 100% sure about this one, but it seems like you have to hit "everything" while under water, including the stuff hidden behind the grass by the entrance of the pipe that you eventually swim into.
I'm curious as to what happens when you hit one of the occasionalswimmers, you don't seem to lose any lives. Maybe you lose points, or are they just a distraction?

Mission 1, Scene 2: Poolside scene
This one has me stumped. Maybe Derryl DePriest from Atari Games will give a hint about this one. I've only seen it once...
What happens is that in the underwater room where you shoot the depth charges, you stick your head above water for a moment and there's a bunch of people sunbathing. After a few moments, you duck back underwater and when you surface this time, it's the normal game.

Mission 1, Scene 2: Pain In The Glass
Hit all the scuba tanks (and the raft?) on the beach. Some near theguy with the metal detector and some near the kneeling woman.

Mission 1, Scene 2: Falling Heads
Still on the beach, hit the two water towers.

Mission 1, Scene 3: Chicken Fry
Hit all the fire extinguishers.

Mission 1, Scene 3: Carnival
You are on a raised catwalk sort of thing. It has a left turn in it and then it goes through a short tunnel to get to where the missile launchers are. There is a civilian in a lab coat hiding behind the barrel right where the catwalk makes it's turn. Hit the two lights on the wall on your right, beyond the civilian.

Mission 1, Scene 3: Star Shooting
Hit all the nuclear warheads right before the part where the two missile launchers start shooting at you.(I might have the room names switched on the last two)

Mission 2, Scene 1: Carnival
Shoot all the posters on the gazebo.

Mission 2, Scene 1: Bachelor Pad (?)
Shoot the three lights on the wall of the bank. They are on the right hand side of the building (facing as you are about to walk into the building). You get a couple of opportunities to hit these.

Mission 2, Scene 2: Pain In The Glass (?)
Shoot all the flower pots sitting along the top of the bank teller counter.

Mission 2, Scene 3: ??????
Once you are in the elevator, shoot all the buttons (one you press for what floor you want).

Mission 3, Scene 1?:
As the jeep going to crash on you, shoot all the parts from it.

Description of the Secret Stages

Sharks Unknown

Carnival
In this one, you shoot targets on top on the screen as well as ducks moving by. The ducks moves very fast so you need to shoot quick, and accurate.

Chicken Fry
In this one, you see a sign says "Chicken Fry." It's nightime as the chickens fly (thrown) towards the sign. Shoot them.

Pain in the Glass
This is one of the easy secret stages. Shoot all the cups, glasses, etc..

Star Shooting
Similar to shooting practice or what you see when you go to the amusement center. You try to shoot the red star out. The number starts at 999 and it goes down as you try to shoot the red out in the time allowed.

The Lollibot
For me, I've only seen/did it once. It's similar to target practice, you try to shoot lollipops around. Don't know what stage though.

Bachelor Pad Unknown

Falling Heads Unknown