Codes

Presently, there is only one version of Majora's Mask.  As always, you must have the expansion pak in order for these to work and you MUST have either a Gameshark Pro 3.3 or a Gameshark 2.5.  Please note that when using the Pro, you cannot activate the Code Generator.  The ROM version of Majora's Mask does work on Nemu64, but can be glitchy.  These codes should work, but I'm not certain (haven't tried it, probably won't).
Codes found by Oddities of Hyrule.
 
F1096820 2400
FF000220 0000
 Enable Code (In Gameshark, label as "(M)")
Allows you to use Gameshark codes with Majora's Mask.
D03E6B3A 00??
P1 Activator 1
Activates the following code when a certain button is pressed.
D03E6B3B 00??
P1 Activator 2
Activates the following code when a certain button is pressed.
D13E6B3A 00??
P1 Dual Activator
Activates the following code when two different buttons are pressed simultaneously.
811F3588 0000
Use Items Anywhere, Anytime
This code allows you to use any of the items/masks at any place, no matter what restrictions were originally set.  This code can cause freezes, so use with caution.
D03E6B3B 0020
813FFE18 40CB
Moon Jump
Just hold down L and Link will rise.
811EF6A6 0140
Infinite Health
Have infinite health.
811EF6A4 0140
Maximum Health
Have all hearts.
801EF6A9 0030
Infinite Magic
Have infinite magic supply.
811EF6AA 03E7
Infinite Rupees
Have an endless supply of rupees.
801EF711 0009
Infinite Arrows
Never run out of arrows (must have bow in order to work).
801EF716 0009
Infinite Bombs
Never run out of bombs (must have acquired bombs already n order to work).
801EF717 0009
Infinite Bombchus
Never run out of bombchus (must already have bombchus to work).
801EF718 0009
Infinite Deku Sticks
Never run out of Deku sticks.
801EF719 0009
Infinite Deku Nuts
Never run out of Deku nuts.
801EF71A 0009
Infinite Magic Beans
Never run out of Magic Beans.
801EF71C 0001
Infinite Powder Kegs 
Always have powder keg.
801EF6E0 0000
Have Ocarina of Time
Have Ocarina of Time.
801EF6E1 0001
Have Hero's Bow
Have Hero's Bow or can use infinite arrows code.
801EF6E2 0002
Have Fire Arrows
Have Fire Arrows.
801EF6E3 0003
Have Ice Arrows
Have Ice Arrows.
801EF6E4 0004
Have Light Arrows
Have Light Arrows.
801EF6E6 0006
Have Bomb
Have bomb or can use infinite bombs code.
801EF6E7 0007
Have Bombchu
Have bombchu or can use infinite bombchu code.
801EF6E8 0008
Have Deku Stick
Have Deku stick or can use infinite Deku stick code.
801EF6E9 0009
Have Deku Nut
Have Deku nut or can use infinite Deku nut code.
801EF6EA 000A
Have Magic Beans
Have magic beans or can use infinite magic bean code.
801EF6EC 000C
Have Powder Keg
Have powder keg or can use infinite powder keg code.
801EF6ED 000D
Have Pictograph Box
Have pictograph box.
801EF6EE 000E
Have Lens of Truth
Have Lens of Truth.
801EF6EF 000F
Have Hookshot
Have Hookshot.
801EF6F8 003E
Have Postman's Hat
Can use Postman's Hat.
801EF6F9 0038
Have All-Night Mask
Can use All-Night Mask.
801EF6FA 0047
Have Blast Mask
Can use Blast Mask.
801EF6FB 0045
Have Stone Mask
Can use Stone Mask.
801EF6FC 0040
Have Great Fairy's Mask
Can use Great Fairy's Mask.
801EF6FD 0032
Have Deku Mask
Can use Deku mask and transform into a Deku scrub.
801EF6FE 003A
Have Keaton's Mask
Can use Keaton Mask.
801EF6FF 0046
Have Breman Mask
Can use Breman mask.
801EF700 0039
Have Bunny Hood
Can use Bunny Hood.
801EF701 0042
Have Don Gero's Mask
Can use Don Gero's mask.
801EF702 0048
Have Mask of Scents
Can use Mask of Scents.
801EF703 0033
Have Goron Mask
Canu use Goron mask and transform into a Goron.
801EF704 003C
Have Romani's Mask
Can use Romani's Mask.
801EF705 003D
Have Circus Leader's Mask
Can use Circus Leader's Mask.
801EF706 0037
Have Kafei's Mask
Can use Kafei's Mask.
801EF707 003F
Have Couple's Mask
Can use Couple's Mask.
801EF708 0036
Have Mask of Truth
Can use Mask of Truth.
801EF709 0034
Have Zora Mask
Can use Zora Mask and transform into a Zora.
801EF70A 0043
Have Kamaro's Mask
Can use Kamaro's Mask.
801EF70B 0041
Have Gibdo Mask
Can use Gibdo Mask.
801EF70C 003B
Have Garo's Mask
Can use Garo's Mask.
801EF70D 0044
Have Captain's Hat
Can use Captain's Hat.
801EF70E 0049
Have Giant's Mask
Can use Giant's Mask and transform into a giant.
801EF70F 0035
Have Fierce Deity's Mask
Can use Fierce Deity's Mask and transform into an adult.
801EF6E5 00??
Event Item 1 Modifier
Modifies the top slot for the event items.
801EF6EB 00??
Event Item 2 Modifier
Modifies the second slot for the event items.
801EF6F1 00??
Event Item 3 Modifier
Modifies the third slot for the event items.
80166118 0020
Maximum Visibility
???
8017CBC4 0020
Semi-Walk Through Walls
Allows you to walk through certain walls.
8017CBAC 0020
Semi-Walk Through Walls #2
Allows you to walk through certain walls/doors.
8017F5B4 0020
No Collisions
Can walk through most objects (not walls, doors).  Immune to some enemies.
80166108 0020
Blue Fog
Changes the environment so that a blue fog envelopes the arena.
8016610C 0020
Pink Fog
Changes the environment so that a pink fog envelopes the arena.
80166110 0020
Yellow Fog
Changes the environment so that a yellow fog envelopes the area.
8016A720 0020
Alternate Entrances
Changes Link's starting position whenever he enters a new area.
8016A718 0020
Fight Majora's Mask
Allows you to fight Majora's Mask in the Beta Quest (no weapons or interface).
8016A717 ????
BQ Exit Modifier
Changes where you arrive when the game starts.  Presumably the Beta Quest, possibly BQ000F.
801EF72D 0005
811EF72E F7CF
All Quest/Status Items
Gives you all items on the Quest Status Screen.
801EF690 00??
Link's Form Modifier
(00 - Fierce Diety Link, 01 - Goron Link, 02 - Zora Link, 03 - Deku Link, 04 - Normal Link)
801EF6BC 00??
B Button Modifier
Changes the item equipped to B.
801EF6BD 00??
C-Left Button Modifier
Changes the item equipped to C-Left.
801EF6BE 00??
C-Down Button Modifier
Changes the item equipped to C-Down.
801EF6BF 00??
C-Right Button Modifier
Changes the item equipped to C-Right.
801EF6DD 0023
811EF72A 201B
All Equipment Upgrades
Upgrades all of your equipment to full?
D03E6B3B 0008
811F35C8 0101
Fast Time Flow (D-Up)
Speeds up the passage of time until the next day or you enter Clock Tower.
811EF6B0 0101
Double Magic Meter
Doubles the amount of MP you have.
801EF68B 00??
Day Modifier
Changes the day you're in (0 - Day 0, 1 - First Day, 2 - Second Day, 3 - Final Day, 4 - New Day).
811EF67C ????
Time of Day Modifier
Changes the time of day (8000 is 12 PM).
801EF6B2 0001
801EF743 0014
Double Defense
Doubles your defensive power.
803FFF03 00??
Mask Modifier
Changes the mask you're wearing (works in any form but can be glitchy).
801E4FAF 00??
Swipe Stay Modifier
Forces the sword swipes to stay for the amount of time specified.
803FFEFF 00??
Hold Weapon Style Modifier
Changes how Link holds his weapon.
803FFF01 0008
Use Shield With Two-Handed Weapons
Allows Link to use his shield when holding two-handed weapons.
811EF686 ????
Time Flow Modifier
Changes the speed of the passage of time (0 - Normal, 7 - Double, 100 - Extremely Fast).
811BDA04 00C7
811BDA06 ADF0
811BDA08 00C7
811BDA0A E2D0
811BDA0C 8080
811BDA0E 0910
811BDA10 8080
811BDA12 3DF0
811BDA18 8080
811BDA1A 1B4C
811BDA1C 8080
811BDA1E 1B28
Map Select
Press Start at the intro screen and it'll pop up.  It's a little glitchy, though... we need an additional code to fix up the errors.  More on that coming soon.
All codes past Have Fierce Diety's Mask courtesy of Child_Link_of_Zelda's site with the exception of the BQ Exit Modifier code and the Map Select code, found by our hacker Cendamos.

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