The Debug Menu is a program for the developers to let them test certain conditions in the game.  Well, they left it in there.  Finally, CodeJunkies.com (Action Replay) was able to get a hold of codes that gives user access to this menu.  This gives you access to tons and tons of features that  without a small guide you would get lost.  Also note, be careful on what you select you may end up freezing the game and you will have to restart.  Also, Also note, it is recommended not to use the memory card while Action Replay Is ON.

How Do I Access The "Debug Menu"?
First you need to find out what verison of SSBM you have.  There are a few different versions of Super Smash Brothers Melee (SSBM).  To find out what version you are using turn the SSBM CD over and put it under a light.  Then find small print on the CD on the black ring.  The version will be in gold.

Now that you see the text look after the "DOL-GALE-0-@@".
The @@ is the version

00    Version 1.0
01    Version 1.1
02    Version 1.2

v1.0
77H8-Y4CD-H4VRY
JR3K-U29H-U6BHT

v1.1
69KC-WJGT-V09F5
P5A0-GP46-M8EB7

v1.2
VBF7-P9Y6-2788D
TDA5-YA0R-8947W

PAL
7X1H-THWE-401YB
47K3-GPZC-DBY82

"DEBUG MENU" OPTIONS OVERVIEW
Versus Mode -- Regular VS Mode Options

   +Character Selection
       Character References

CAPTAIN -- Captain Falcon
DONKEY -- D.K.
FOX -- Fox
GAMEWATCH -- Mr. Game & Watch
KIRBY -- Kirby
KOOPA -- Bowser
LINK -- Link
LUIGI -- Luigi
MARIO -- Mario
MARS -- Marth
MEWTWO -- Mewtwo
NESS -- Ness
PEACH -- Peach
PIKACHU -- Pikachu
POPONANA -- Ice Climbers
PURIN -- Jigglypuff
SAMUS -- Samus
YOSHI -- Yoshi
ZE->SE -- Zelda
SE->ZE -- Sheik
FALCO -- Falco
CLINK -- Young Link
DRMARIO -- Dr. Mario
EMBLEM -- Roy
PICHU -- Pichu
GANON -- Ganondorf
MASTERH -- Master Hand
BOY -- Male Wireframe
GIRL -- Female Wireframe
GKOOPS -- Giga Bowser
CREZYH -- Crazy Hand
D_SANDBAG -- Sandbag
D_POPO -- Popo
D_NONE -- No Character

   +Scale Select
       Scale Select is the size of the character.  When you put it at .1 your character will barely be visible on the screen.  While 5.0 your character will clog the screen up with your character.

   +Kind Select
       Kind select is the controller of the character.
GM_HUMAN -- Human Controlled
GM_CPU -- Computer Controllered
GM_DEMO -- Human Controlled Computer
GM_NONE -- No Player Active
       Freeze Note: Two players have to at least be controlled otherwise it will freeze.

   +Color Select
0 -- Default Colors
1 -- Costume 2
2 -- Costume 3
3 -- Costume 4
4 -- Costume 5
5 -- Costume 6
6 - 9 -- Default Colors without Life Icons

   +Sub-Colors
0 -- Default
1 -- White
2 -- Dark
3 -- Total Black
4 -- Total Grey
       Freeze Note: All other numbers will freeze game.

   +Damage Set
       Starting player damage.  Range: 0 - 999

   +Offense Ratio
       Changes the damage given Range: 0.10 - 3.00

   +Defense Ratio
       Changes the characters speed of taking and losing damage.  Range: 0.10 - 3.00

   +CPU Type Set
       AI Options for the computer.

AIR -- CPU can't jump high
COOPERATE -- CPU follows and attacks you
DEFENSIVE -- CPU utilizes defensive moves
ESCAPE -- The CPU runs away from the player
EVZELDA -- unknown
FREAK -- CPU stays, but attacks when you come close to them
ITEM -- CPU is normal, but attempts to grab any items that appear
JUMP -- CPU jumps
MANUAL -- Human controllable CPU
NANA -- unknown
NOACT -- CPU does nothing
NORMAL -- Default CPU actions
ONLYITEM -- CPU only attacks while holding an item
SPLWLINK -- CPU Link uses Down + B attack (from an event match)
SPLWSAMUS -- CPU Samus uses Down + B attack (from an event match)
STAY -- CPU stands still
STRUGGLE -- unknown
WALK -- CPU walks

   +CPU Level Set
       Changes the difficulty of the computer. Range: 1-9

   +Team Select
       Select the team each player will be on.

   +Stage
       Here is a list of stages.  From target tests to bonus levels.

Dummy -- Freeze Note: Freezes the game
Test -- No texture level, has a pub or coffee shop background
Izumi -- Foutain of Dreams
PStadium -- Pokemon Stadium
Castle -- Princes Peach's Castle
Kongo -- Kongo Jungle
Zebes -- Planet Zebes
Corneria -- Corneria
Story -- Yoshi's Story
Onett -- Onett
MuteCity -- Mute City
RCruise -- Rainbow Cruise
Garden -- Kongo Jungle
GreatBay -- Great Bay
Shrine -- Hyrule Castle
Kraid -- Brinstar
Yoster -- Yoshi's Island
Greens -- Green Greens
Fourside -- Fourside
INSHIE1 -- Mushroom Kingdom
INSHIE2 -- Mushroom Kingdom 2 (Subcon)
AKANEIA -- Fire Emblem level  Freeze Note: Freezes game
Venom -- Venom
Pura -- PokeFloats
BigBlue -- Big Blue
IceMt -- Icicle Mountain
IceTop -- Freeze Note: Freezes game
Flatzone -- Flatzone
Old PPP -- Old Kirby Level
Old Yosh -- Old Yoshi Level
Old Kong -- Old Kono Jungle
Battle -- Battlefield
Last -- Final Destination
TMario -- Mario's target test
TCaptain -- Captain Falcon's target test
TCLink -- Young Link's target test
TDonkey -- Donkey Kong's target test
TDrMario -- Dr. Mario's target test
TFalco -- Falco's target test
TFox -- Fox's target test
TIceClim -- Ice Climbers' target test
TKirby -- Kirby's target test
TKoopa -- Bowser's target test
TLink -- Link's target test
TLuigi -- Luigi's target test
TMars -- Marth's target test
TMewtwo -- Mewtwo's target test
TNess -- Ness's target test
TPeach -- Peach's target test
TPichu -- Pichu's target test
TPikachu -- Pikachu's target test
TPurin -- Jigglypuff's target test
TSamus -- Samus's target test
TSeak -- Sheik's target test, beta
TYoshi -- Yoshi's target test
TZelda -- Zelda's target test
TGameWat -- Mr. Game & Watch's target test
TEmblem -- Roy's target test
TGanon -- Ganondorf's target test
1-1Kinoko -- Mushroom Kingdom, Freeze Note: Freezes at the Yoshi battle (Adventure Mode)
1-2Castle -- Princess Peach's Castle (Adventure Mode)
2-1Kongo -- Kongo Jungle (Adventure Mode)
2-2Garden -- Jungle Japes (Adventure Mode)
3-1MEIKYU -- Underground Maze (Adventure Mode)
3-2Shrine -- Hyrule Temple (Adventure Mode)
4-1Zebes -- Planet Zebes (Adventure Mode)
4-2DASSYUT -- Brinstar Escape (Adventure Mode)
5-1Greens -- Green Greens with single Kirby (Adventure Mode)
5-2Greens -- Green Greens with team of Kirby's (Adventure Mode)
5-3Greens -- Green Greens with a giant Kirby (Adventure Mode)
6-1Corneri -- Corneria (Adventure Mode)
6-2Corneri -- Corneria with attack-happy ships (Adventure Mode)
7PStadium -- Pokemon Stadium (Adventure Mode)
8-1BBRoute -- Big Blue (Adventure Mode)
8-2Mutecit -- Mute City (Adventure Mode)
9-1Onett -- Onett (Adventure Mode)
10-1IceMt -- Icicle Mountain (Adventure Mode)
10-2 -- Freezes (Adventure Mode)
11-1Battle -- Battlefield (Adventure Mode)
11-2Battle -- Battlefield with alternate BG SFX (Adventure Mode)
12-1Last -- Final Destination (Adventure Mode)
12-2Last -- Final Destination (Adventure Mode)
TUKISUSUE -- Race to the Finish
FigureGet -- Snag the Trophies  Freeze Note: Freezes when trophy falls
HomeRun -- Home Run Contest
Heal -- All-Star Mode healing area

   +Melee Kind
       The two types of battles.  Options: Battle Royal or Team Battle.

Versus Mode -- Rules
   +Rule
       Select what type of game to play.  Values: Time Mode, Stock Mode, Coin Mode, and Endless Mode

   +Time (minutes)
       Enter the amount of time for the game.  Range: 0 - 100 minutes

   +Time (seconds)
       Enter the amount of time for the game.  Range: 0 - 59 seconds

   +Stock
       Enter the amount of lives for everyone.  Range: 0 - 99

   +Damage Ratio
       Change the amount of damage you do.  Range: 0.10 - 3.00 (the higher the harder to KO)

   +Vibration Select
       Toggle the rumble feature on your controller. (Must be supported by controller)

   +Item Switch
       Here is the list of items you can select to have appear in the game.  You can also select the frequency at which these appear.
       Choices: Nothing, Very Low, Low, Medium, High, Very High

CAPSULE -- Capsule
BOX -- Crate
TARU -- Barrel
EGG -- Egg
KUSUDAMA -- Party Ball
TARUCAN -- Barrel Cannon
BOMBHEI -- Bob-Omb
DOSEI -- Mr. Saturn
HEART -- Heart Container
TOMATO -- Maxim Tomato
STAR -- Starman
BAT -- Homerun Bat
SWORD -- Beam Sword
PARASOL -- Parasol
G SHELL -- Green Shell
R SHELL -- Red Shell
L GUN -- Ray Gun
FREEZE -- Mr. Freeze
FOODS -- Food
MSBOMB -- Motion Sensor Bomb (Proximity Mine)
FLIPPER -- Flipper
S SCOPE -- Super Scope
STAR ROD -- Star Rod
LIPSTICK -- Lip's Stick
HARISEN -- Fan
F FLOWER -- Fire Flower
KINOKO -- Super Mushroom
DKINOKO -- Poison Mushroom
HAMMER -- Hammer
WSTAR -- Warp Star
SC BALL -- unknown
RABBITC -- Bunny Hood
METALB -- Metal Box
SPYCLOAK -- Cloaking Device
M BALL -- Pokeball
KURIBOH -- Goomba
LEADEAD -- Redead
OCTAROCK -- Octaroc
OTOSEI -- Topi
NOKONOKO -- Koopa Troopa
PATAPATA -- Koopa Paratroopa
LIKELIKE -- Like-Like
MATO -- Target
HEIOH -- Fly Guy
WHITEBEA -- Polar Bear
KLAP -- Red Klap Trap
ZGSHELL -- Koopa Shell
ZRSHELL -- Koopa Shell

       Here is a list of Pokemon you can select to appear from the PokeBalls

TOSAKINTO -- Goldeen
CHICORITA -- Chicorita
KABIGON -- Snorlax
KAMEX -- Blastoise
MATADOGAS -- Weezing
LIZARDON -- Charizard
FIRE -- Moltres
THUNDER -- Zapdos
FREEZER -- Articuno
SONANS -- Wobbuffett
HASSAM -- Scizor
UNKNOWN -- unknown
ENTEI -- Entei
RAIKOU -- Raikou
SUIKUN -- Suicune
KIRIHANA -- Bellossom
MARUMIN -- Electrode
LUGIA -- Lugia
HOLIOLI -- Ho-oh
METAMON -- Ditto
PIPPI -- Clefairy
TOGEPY -- Togepi
MEW -- Mew
CEREBI -- Celebi
HITODAMAN -- Staryu
LUCKY -- Chansey
PORYGON2 -- Porygon2
HINOARASHI -- Quilava
MARIL -- Marill
FUSHIGIBANA -- Venusaur

Result Test Options
   +Overview

1P KIND -- Change 1P's character
2P KIND -- Change 2P's character
3P KIND -- Change 3P's character
4P KIND -- Change 4P's character
ALL PLAYER -- Switch what character everyone will be
1P RANK -- Set 1P's rank
2P RANK -- Set 2P's rank
3P RANK -- Set 3P's rank
4P RANK -- Set 4P's rank
1P WIN -- Set 1P's pose
2P WIN -- Set 2P's pose
3P WIN -- Set 3P's pose
4P WIN -- Set 4P's pose
ALL COLOR -- Change the color of the characters
STEP ANIM -- Turns animation on (1) and off (0)   Freeze Note: Might freeze if 0.
PANEL HIDDEN -- Hides the Panels

Language Options
   +Overview

GMLANGTYPEUS -- English
GMLANGTYPEJP -- Japanese

Publicity Options
   +Overview

       Toggle the crowd sound effects on or off.

DB Level

Master -- Default
No-Debug-ROM -- unknown
Debug Develop -- unknown
Debug ROM -- unknown
Develop -- Gives you access to special button combinations

   +Button Combinations to use when Debug or Develop is selected
       Lag Note: Spawning too many objects will cause game to lag

Up-  -- Change camera view (close-up, normal and stationary, use C to rotate the camera, in addition you can hold left on the d-pad + the c-stick to
            zoom in and out and hold right on the d-pad + the c-stick to pan the camera.)
Down -- Generates the selected item
Right -- No function
Left -- No function
Pause -- Pauses the game/frame, you can press Z to advance frame by frame
A + Up -- No function
A + Down -- No function
A + Right -- Majorily speeds everything up. Computer players are deadly when this occurs.
A + Left-- No function
A + Y -- Press left when holding these two buttons and your character shrinks
B + Up -- No function
B + Down -- Brings up some co-ordinates. Two of these are the character's defense and offense ratios.
B + Left -- Shows the special bonuses you have won, but the names are a bit different
B + Right -- No function
X + Up -- Actually pauses the game, you can quit the match here
X + Down- -- No screen icons. Press again, white screen, press again, black screen, press again, back to normal.
X + Left -- Toggle SFX (sound effects) and BGM (background music) on and off
X + Right -- Shows more co-ordinates of some sort
Y + Up -- No function
Y + Down -- Displays yet another set of coordinates
Y+ Left -- Makes you large
Y + Right -- Makes you regular size
R + Up -- Shows the character's collision bubbles. Press again to overlay the collision bubbles on the character
R + Down -- Has many effects on the stage when pressed several times.
R + Left -- Press lots of times to show white boxes. It will also display white pivot spheres on characters. These help to position some attacks.
R + Right -- Turns character into yellow figure
L + Up -- Scroll through list of items to drop
L + Down -- Scroll through list of items to drop
L + Left -- Scroll through list of pokemon to come out of pokeball.
L + Right -- Scroll through list of pokemon to come out of pokeball.

IK Debug Flag
       Lets you use six players in a match (4 humans and 2 CPUs max).

       Below are the codes that will allow you to use this addition.

v1.0
DC18-H909-BFGB3
5MBW-XH02-HEA88
DF6M-CM56-5DFEN
XWKH-KP1E-PM9N9
KH2Z-FYVW-9GX62

v1.1
B0B7-DFPZ-JXU2C
UJZC-P4T7-BE2C8
4CVZ-Z72C-Y9KPT
HA0B-9T4K-B6T9X
4GMT-1UY3-K3ARA
V0PP-FJT9-BGMJ1
NV6F-J84A-DGR1X
K3NW-KV2B-A5T3G
XRP0-73AB-GWHVP
8M2J-8JJE-NZ87Y
U9KG-QUUF-TV6AJ
TZDK-U92A-MHWC4
RHKY-YE87-UY9HZ
RCM6-V8G2-Q7Y9Y
2PDE-VXZM-1AEM1
7TU7-U77F-26E52
FYVK-MTDA-D9WEF
80YF-0VW1-EKRRK
X5FB-YJ0Q-2WW2B
8R8W-3BVX-B4ADK
F60M-CN58-N1PQT
CT9B-K3EX-JWV8Y

v1.2
3PDT-9QAN-WQD7B
FGHB-VGKG-4UYHN
M4EJ-D9FZ-N0QF2
CA7W-33QH-2YBTN
39ZG-R2N0-GVYKH
TVRB-QAFG-CWAYJ
R5GP-ZKPM-ET70Q
DQYF-ZMBD-TEG68
RAU2-V3QR-Z6KRH
W07K-3VC8-TG4BJ
EQGT-8UBP-GJVU1
PCHW-7BZ5-W796P
4J70-ZWKW-8A3EC
HYYW-U36B-12YE5
AN6F-FH6P-KYCF4
YM68-1NCZ-CU2UN
3J66-2JWB-7G8ZE
058T-3Q62-YJCZX
9XK9-ZFJN-85BHK
RGM2-69TH-KJ80U
Q6CZ-H78U-MR8J1
Q5FP-96GN-BHFT1
CGCU-PRR4-21P0U
63VU-8WB2-ZFUG9
EURR-UXUJ-1VKYA
RJPX-EXCD-F7U7Y

PAL
0728-V3UE-GJR0X
G5HV-WFZU-EEBCB
8QYZ-3JF5-N81JP
2NHJ-ZNME-A0HUA
41KJ-MAH8-JQBQ7

       Now you can change where players get their settings from.

1
Player 1 gets data from player 1
Player 2 gets data from player 2
Player 3 gets data from player 3
Player 4 gets data from player 4
Player 5 gets data from player 3, char from ALL_CHAR, kind from ALL_KIND
Player 6 gets data from player 4, char from Publicity, kind from ALL_KIND

0
Player 1 gets data from player 1
Player 2 gets data from player 2
Player 3 gets data from player 1, char from ALL_CHAR, kind from ALL_KIND
Player 4 gets data from player 2, char from Publicity, kind from ALL_KIND
Player 5 gets data from player 3
Player 6 gets data from player 4

New Defcalc
       unknown function

Global Data Edit
 Advanced -- unknown

Mode Team Test
    basic test area