Here's how to access a hidden cheat menu. In order to reach 
it, you do NOT enter a key sequence as with most games, 
but rather, you must first discover Level 32, then survive it, 
and collect all three keys in it. Getting all three keys is NOT 
necessary to exit the level, but is needed to gain access to the 
Cheat Menu. To get the secret Cheat Menu, U must find the 
hidden Level, which is Level 32-Hectic Here is how to get to 
Level 32-Hectic To reach Level 32-Hectic, you must start a 
new game. Go through Level 1-The Staging Area, and destroy 
ALL the barrels, except the one to the right of the start. There 
are a total of 10. Remember the secret areas, the room with 
the exit, and the alcove in the hallway leading to the exit. Be 
sure to collect the Soul Sphere and Combat Armor for a better 
chance at surviving later on. Once you've destroyed all of the 
level's barrels, take the teleporter that you can access from the
secret area behind the Blue Door. When you reappear, destroy 
the barrel ahead of you on your right and enter the door behind 
you. A secret area will temporarily open on the left wall that
leads to Level 32-Hectic. Now Remember, to access the Hidden 
Cheat Menu, you must get ALL THREE KEYS on Level 32, so 
here is how you go about doing that... At the beginning of 
Level 32-Hectic, enter the door to the right for the Red Key. 
Once you pick it up, you'll be dropped into a room with three 
Arachnotrons. Quickly go left or right to get the Rocket Launcher. 
Destroy the Arachnotrons and return to the door that leads to this 
room. Beware of the crushers that come down from the ceiling, 
search the wall to lower it and let it raise you back to the main 
room. Enter the door on the other side of the room to get the 
Blue Key. As soon as you get it, run back to the door you 
entered from. The ceiling will crush you if you stay in the 
alcove where you find the Blue Key. Four Hell Knights 
will appear and the door you came in from will be closed. 
Destroy them with your Rocket Launcher to be able to 
leave the room. Enter the door on the left side of the room, 
at the opposite wall is the Yellow Key. The floor rises in 
different parts of the room, and darts will fire from the faces 
in there. Try your best to avoid damage while getting the 
Yellow Key. Exit the room to return to the start. Directly 
across from you is a switch you will now be able to access. 
Having the keys, you can now remove the bars and press the 
switch to exit Level 32-Hectic. Once this is completed, you 
will gain access to the Features Cheat Menu in the Options. 
In that menu, you will find the following cheats...
1. Warp to Level-This is the ONLY way you can access 
Level 25-Cat and Mouse, Level 26-Hardcore, and Level 
27-Playground Three secret levels in between Level 24 and 28.
2. Invulnerability-Turn the Mode ON/OFF using Button A or B.
3. Health-Use Button A or B to restore your health.
4. Weapons-Use Button A or B to get all weapons and full ammo for each.
5. Map Everything-Turn Map Everything ON/OFF using Button A or B.
This is VERY HARD to do, beating Stage 32 is very hard, but if you
succeed and get all three keys, the cheat menu will appear.


W93M 7H2O BCYO PSVB 

This code will give you 100 health, 200 armor, all weapons, full ammo, 
back pack, levels 29,30,31 finished, at the last level, and the 3 pentagram 
items that enhance your laser gun to be 3 times stronger than the bfg9000 
and can kill the last boss in 4 seconds. The 3 pentagram items also let 
you use the 3 switches in the last level (closes the gates that spawn 
the monsters), and the laser now shoots faster and stronger. 

Easy way to get the Cheat Menu 
Type at the password screen,

?TJL BDFW BFGV JVVB 

Now press Start and you will see a new feature named feature.

To warp from Menu, hold L & R (C) Buttons.
Go back to the Menu after you warp and reactivate your cheats!

In Level one, the staging area, destroy all the barrels except
for the one to the right of the beginning. There are a total
of 10. When you've destroyed 9 go to the blue door, look behind
you and open the wall. You will warp to the beginning of the
stage. Shoot the barrel to the right and go in the door behind
you look to the left and go in the warp to Level 32