* Underneath the Innocent sign (located outside) is an RPG. To get the RPG, however, you need to do quite a bit of jumping. First, jump onto the brown crate. Secondly, from upon the brown crate jump to the inclined roof (when facing the Innocent sign it is on your left). Finally, jump to the ledge just underneath the Innocent sign. Take note, the secret isn't the RPG, but instead the ledge underneath the Innocent sign. Thus, it is possible to trigger the secret and not obtain the RPG. Why exactly you'd want to do that is beyond me.

* There is a hidden apartment near the Innocent sign. To reach it you must jump on top of the brown crate located below the Innocent sign. From there jump to the inclined ledge. Finally jump into the middle window to find the hidden apartment which contains a box of ammo for the RPG. Be aware, you are not credited with finding the secret apartment unless you move close to the couch inside the apartment. That is what triggers the secret. Another way to enter is jump on top of the parking sign located near the dumpster. From there jump onto the ledge below the windows. The final step is simply to jump into one of the two windows.

* Inside the hidden apartment there is a door that is being covered by a poster. All you have to do is open that door by standing in front of the "Attack Of Bleached Blonde Biker Bimbos" sign. Inside you'll find steroids.

* There is a hidden room inside the projection room that contains an RPG. All you have to do in order to find the hidden room is jump on top of the projector and the secret door will automatically open. Inside you'll find an RPG. Beware though because also hiding inside that door is an enemy.

* There is a hidden door in the Projection room. To open it stand close the fire extinguisher, but face the wall to the left of it. Inside you'll not only find a box of shotgun shells, but also another entrance to the venilation shaft. The other entrance is found in the bathroom. Thus, the secret room that links the projection room with the venilation shaft can also be found when you enter the venilation shaft through the bathroom.

* For two boxes of shotgun ammo and the all important jetpack it is worth it to blow up movie screen even if there is a dancer. Turn on the movie projector from the projection room and then go down to by the movie screen. Use either a pipe bomb or RPG at the lower middle portion of the screen to reveal this secret. The window on the left wall overlooks the back entrance to the movie theater. Blow it away if you want a quick way out.

* It is a bit tricky to reach this secret room, but the chain gun, RPG, shotgun, and box of pipebombs that are found there are well worth trying. From the beginning of the exit bridge you'll want to fall off to the right. You must stay very close to the wall because you are trying to fall onto the small ledge that lines the wall. Follow the ledge all the way around the building until you reach the front of the movie theather by the marqee. From there proceed to jump to the top of the palm tree. Then, face the building and try to jump through the windows that are just above the top of the palm tree. You'll have to jump a little to the left or a little to the right to be able to go through the windows because there's a divider straight ahead. If you just can't seem to make it along the ledge to the palm tree or jump through the windows and into the secret room, the other alternative is to use a jetpack.

* To reach a full armor and a heal you can use the lift in the main lobby. If it were only that easy though. First you'll need to push a button on the cash register located in the main lobby. That will open the hidden door. Next, you'll need to find the hidden lift which is located directly below the door you just opened. Thus, the hidden lift is just to the right of the "Attack Of Bleached Blonde Biker Bimbos" poster. You won't see the lift, you just stand on the floor and try to activate it.
A holoduke can be obtained inside the venilation shaft by blowing away the wall. The wall you'll want to blow away is the inside wall of the right angle the venilation shaft forms. It is difficult to difficult to do this without losing health because obviously using high powered equipment in a venilation shaft is not a safe situation. Pipe bombs are the best way to go if want to avoid losing much health.
By playing the Duke Nukem arcade game in the arcade you open a secret door. Simply walk up to the game and try using it. Duke will say "Hmmm.. don't have time to play with myself" which lets you know the door opened. It is located behind the Duke arcade machine, but a little bit to the right. Then proceed to walk up to the open door and take the holoduke. There is no need to jump into the small niche containing the holoduke. However, if you do and while your inside the door close, there is a toggle switch in there that will open the door from the inside.
For quick access to the front of the movie theater you can blow away the right wall of the ticket booth. You'll want to aim the RPG or a pipebomb through the ticket booth's window at the right wall inside. This is best done with a pipebomb so you can avoid loosing any health, but it also can be done with the RPG and you won't lose any health if it is done properly.
If you try pushing the trashcan located in the main lobby next to the arcade lift you'll open a door. However, in order to reach the door you need to do two things. First, jump onto the trashcan you just pushed. Secondly, while on top of the trashcan and facing the wall, jump. You'll see an open door with a small medkit, box of pipebombs, and a pair of night vision goggles. Simply move onto the ledge while you are in midair to and then collect the items. The intended way for this to be done is pushing the wall when you are on top of the trashcan to reveal the door. However, pushing the trashcan is probably easier. Neither was is too difficult though.
While you are on the exit bridge turn on your jetpack and ascend as high as you can. Once you reach the top you'll see two wall mounted guns shooting at you. Blow them away as they do count in the enemy count at the end of the level. Also you should notice a niche (behind you when facing in the direction of the exit below) which contains two boxes of shotgun shells and a jetpack.

* Inside the Forbidden Videos & Books there is a hidden holoduke and healing atom. To reach this holoduke go to the back left corner of the bookstore, behind the counter. From there jump on top of the bookshelf. Reveal the hidden door by pushing against the wall in the corner. Inside you'll find the holoduke and a healing atom.

* Lining the right wall of Forbidden Videos & Books are several book cases. One of them is really a secret door. Behind the door is a RPG and armor. The book shelf that moves is the third from the left when facing the shelves.

* When you begin to reach the end of the dark hallway past the locked door in Forbidden Videos & Books turn to the right as soon as you can. Proceed to walk forward until you hit a wall. At that point turn to your left and go straight until you enter a lighted area. There you will find a healing atom. This secret is best done when using the night goggles. Otherwise, it will probably take you a few tries.

* There are two ways to access a hidden area which contains steroids and a holoduke. The first, and probably more difficult way, is to go through the sewer. In order to do this blow open the man hole cover which is found on the demolished building. It is easiest to open the man hole cover with a pipe bomb. Now, fall through the man hole and follow the sewage until the end. At the end if you look to your left you'll see a dry area. The dry area is ramp which leads upwards to the bathroom in the strip club. Along the way up the ramp you'll see the holoduke and steroids. Unfortunately, you cannot enter the strip club from the sewer because the door is locked. Thus, the alternative way to do this secret is enter the only stall in the strip club's bathroom. The back wall of the stall is a locked door which can only be unlocked from inside. Once you open the door you'll be at the top of the secret ramp which leads into the sewer.

* Near the back left corner of the dance area is a couch. By standing on this couch you'll open a door on the right wall behind the dancers. The door only stays open for a very limited amount of time so you'll have to hurry to make it before the door closes. Inside you'll find a chaingun and a box of ammo for the chaingun. Also, there is a toggle switch which opens the door in case it closes while you are inside.

* There is a venilation shaft on the right wall in the dance area. It isn't that the venilation shaft is hidden behind a door or anything it is just hard to spot. You'll have to jump to reach it, but once blown away you can get backstage. Backstage is were you'll find the exit. As you travel through the shaft you will be able to pick up a healing atom and a box of pipebombs.

* A pair of night goggles can be found backstage on the raised platform next to the lever that opens and closes the curtains. To get there up there you'll need to use a jetpack. I'm quite sure this secret can be done without a jetpack, but as of yet I don't know how.

* Backstage you'll see a raised platform the leads to two wodden crates. Look at the wall behind these wooden crates. It is lit in only one small area. That part of the wall is actually a door. Swing open the door to reveal a box of RPG ammo.

In the back of Forbidden Videos & Books are two signs. One reads "No One Under 18 Permitted". Follow the direction of that sign, left, until you reach a somewhat long hallway lined with a blue curtain. Each section of that curtain is actually a door to peepshow. Each of these contain an item of some sort. The item is either revealed when a garbage can is shot at or it is found in place of the peepshow monitor.
When you are inside the bathroom at Forbidden Videos & Books use the dryer. This will cause a door to open in the middle of the bathroom revealing a pair of night goggles.
You'll find the red keycard in the bar, but it is not out in the open. In order to find it simply open the cabinet underneath the shelf with all the wine bottles on it.

* A. Enter the booth which lies to your right when you start the level.
B. Press the left hand switch inside the booth next to the window.
C. Notice that caused the elextric chair to lower. You can go below, where the electric chair is now, by walking while you duck. You can collect a shotgun and box of shotgun ammo.

* A. Push on the face in the chapel. It is on the dais. It should've caused the cross to turn upside-down. Also a door should've opened behind the stained glass window on your left.
B. Before entering the door kill the octabrain by shooting him through the cross. Hell of a lot easier than facing him in the tunnel.
C. Enter the door which leads you through a tunnel behind the cross. At the end you'll pick up a chaingun and see a "DOOMED space marine."
1. Shoot the hanging monk in the chapel. He's hanging from the ceiling in the back of the chapel.
2. Collect the healing atom that falls from the ceilling when you shoot him.

* 1. In the chapel, stand against the back wall in the middle. Face the dais and notice there is a switch above it.
2. Shoot the switch. This is probably best done with the shotgun.
3. Shooting the switch causes a platform under you to raise. Turn around once the platform is at it's peak and collect the armor and healing atom.

* 1. The jail cell with the toliet has a bed. Push against the bed to reveal a secret hole.
2. Duck down and enter the hole. Collect the RPG ammo.
1. In the gear room, jump onto the smaller of the two gears.
2. From there jump to the healing atom. Follow the ledge all the way around.
3. Face the wall and push against it. It should reveal a pair of night goggles.

* 1. In the open courtyard, get on either side of the high ledge that is divided by the tall structure. To do this you'll have to climb on one of the inclines on the front of the structure and jump from there.
2. While on the ledge use the incline to climb up the side of the structure dividing the ledges. You should walk right into the structure and be able to collect three healing atoms.
1. In the room that spins when you push the switch there's a venilator shaft.
2. However, you can't see it until you spin the room.
3. Once you spin the room shoot the venilator shaft open and jump in. There'll be an armor.

** 1. Once you get in the spinning room, spin it so there is a red door in the back.
2. Open the door and detonate the laser triggered mines using a pipebomb or RPG.
3. Cross the bridge and open the panel at the end. This reveals a map, but also, reveals two alcoves. One to your right and one to your left.
4. You'll have to jump to reach them. The one to your left contains pipebombs while the one to your right contains a healing atom. They each count individually as a secret at the level's end.

1. In cell 3 of cell block 2 there is a poster. You can walk through the poster. It is transperent.
2. Once you walk through the poster and reach a dead end blow up the wall using a pipebomb.
3. Do that a second time when you reach the next dead end.

* 1. Go to the large door which leads into the back entrance of the courtyard. Jump on top of the pilar that has the switch on it.
2. Now face the wall and open the hidden door. You'll be able to get night goggles.

* 1. At the beginning of the level, once your outside of the sub, look for an underwater cave. There is an octabrian right at the start of the cave.
2. Follow the cave all the way until the end. When you come out of the water you'll be in a secret area. You will have to blow up the wall when the cave comes to a dead end.

* 1. Stand on top of the suken sub. This causes a secret place to open inside the sub.
2. Thus, reenter the sub. Go all the way to the top. There you'll be able to collect some armor and a medkit.

* 1. Go to the ledge that over looks the sunken sub and has the blue access card.
2. Both of the alcoves that house a mounted gun have secret doors. Only the one on the right counts as a secret though. Jump to the right one. It is a tough jump, but it can be done. Open the secret door which is in the back on the right wall. Inside you'll find RPG ammo.
3. The one on the left cannot be reached without a jetpack. Considering you cannot have a jetpack the only way to reach it is using a cheat code to get the jetpack. See section 5.1 for more information on cheat codes.
4. Once you jetpack over, the hidden door is on the left wall near the back. Inside the wall says "How did you get here."
5. Near the front of the hidden room on the right wall open another hidden door. It contains a holoduke.

* 1. After you enter the structure using the blue access card walk to the part were the hallway begins to bend.
2. The wall to your right opens revealing an empty room.
3. Open the wall in the back of this room to lead to a chaingun.

* 1. When your on the conveyor belt and the atmosphere becomes red get off on to the landing where the sewage is.
2. The back wall of that landing opens. Collect the chaingun ammo.

* 1. After the red toxic area the coveyor belt brings you to a room with two cylinders. Activate the switch on the wall to open the cylinders.
2. Enter the one closest to the back wall. Jump up and while in mid air move forward.
3. You should fall on a landing. You'll probably collect the heal without getting on to the landing. However, you don't get credit for the secret unless you get on the landing.

* 1. Once you raise the water level you can get one a V-shaped rock. Go to the right part of the rock.
2. From there jump to the opening you see in the wall. I'm pretty sure you'll have to use steroids.
3. Inside there turn on your night goggles. Get the RPG ammo, medkit, and shotgun. Note, it is not until you jump on the ledge with the medkit that the secret is registered as being found.

*** 1. After jumping from the left side of the V-shaped rock to the landing you'll see a crack on the wall to your left. Blow it open.
2. Inside there you'll see another crack. Blow it open too.
3. Now you'll collect a healing atom and see yet another crack in the wall to your left. Blow it open for another secret and a quick way back to the start of the level.

* 1. In the room with the switch that opens cell block two push against the right wall in the back.
2. Now duck to enter the hidden room. Inside there's shotgun ammo and scuba gear.
1. After you pass the gears you are faced with four black walls. The one in the back right corner is transperent. Go through it.
2. Collect the armor and scuba gear.

* 1. After the gears you'll come to a place where you travel through the tunnel with the flow of water. Keep an eye on the right wall for a crack. When you see it blow it open using a pipebomb or RPG.
2. inside you'll see a medkit and a transporter. Use the transporter to reach a secret area with RPG ammo.

* 1. At the start of the green tunnel look for the source waterfall. Right above it is a venilation fan. Blow it up.
2. Now using the ledge on the right side of the room jump into the area you exposed. Inside you'll find two heal atoms.

* 1. At the last lighted part of the sewer before the end, notice there's crack in the left wall. Blow it open using RPG or a pipebomb.
2. It contains the secret level exit. just hit the button to exit the level like you would any other.

* 1. The spring near the chanting cave is transperent. Walk through it for a chaingun.

* 1. In the ceremonial fire room, jump into the fire. The fire you want to jump into is encircled with a high stone wall on all sides.
2. This will transport you to another room. Jump out of the pit and collect the two healing atoms and RPG ammo.

* 1. In the secret room that you get to from jumping in the fire pit there's a stepping stone. Use it to reach an alcove in the wall to your right. Collect the RPG ammo.

* 1. After you put your hand in the print that opens the door in the ceremonial fire room jump on top of it.
2. From there jump to the alcove above you and on your right. You'll find a pair of night goggles.

* 1. Pressing the handpring at the end of the long tunnel that connects to the lava lake opens a door above the right lavafall. Jump through the door.
2. Jump on the river through the door until you see a landing on your left.
3. Jump to the landing. Follow the tunnel.
4. You should see a girl dancing and some heal atoms. Collect the two heal atoms.

* In the room with the handprint that opens the lava river there's a crack in the back right wall. Blow it open for a medkit, 2 boxes of shotgun ammo, pistol ammo, and chaingun ammo. Also it leads to back near the level's start.

* Using the jetpack fly towards the shrink ray cave. Inside you'll see a message that says "You are not supposed to be here - Levellord." Interesting, but real serves no purpose.

* After you get your first look of the ship you'll soon come to a part, in which, you must jump from pilar to pilar. If you look at front of the first pilar you'll see the "Dopefish Lives" message. This message is near the bottom, thus, the easiest way to see it is to put the game in god mode. Then, fall down. Once you reach the bottom begin looking for it on the pilar.

* 1. As you face the huge ship door the wall behind you in the right corner is actually a door. Open it.
2. Follow the path up until you reach the healing atom. Collect it.

A slow, but easy way to gain health is to drink some water. In order to do this you'll need to shot at a fire hydrant, a toliet, or a urnial. That will cause it to explode and shot out water. Now walk close to the water and drink away by press the open button or key.

A great way to obtain 10 health is to use the bathroom. All you have to do is walk up to a toliet or urnial and press the open button or key. This will cause Duke to say "Ahhh... much better" and give you 10 health.

The laser triggered mines can be set off with the RPG or a pipebomb.