From CloudModding MM Wiki
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Majora's Mask Exit List (go to offsets shown in the scene files and edit the two bytes there):
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Clocktown (Main Rooms):
> North Clocktown
>> 0x132 = Great Fairy's Fountain
>> 0x130 = South Clocktown
>> 0x12E = East Clocktown
>> 0x12C = Termina Field
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> East Clocktown
>> 0x1F0 = Termina Field
>> 0x1F2 = South Clocktown (Next to Shooting Gallery)
>> 0x1F4 = Path to Astral Observatory
>> 0x1F6 = South Clocktown (Next to Inn)
>> 0x1F8 = Treasure Chest Shop
>> 0x1FA = North Clocktown
>> 0x1FC = Honey and Darling's Place
>> 0x1FE = Mayor's Residence
>> 0x200 = Shooting Gallery
>> 0x202 = Bottom Stock Pot Inn Door
>> 0x204 = Top Stock Pot Inn Door
>> 0x208 = Milk Bar
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> South Clocktown
>> 0x184 = Under Clocktower
>> 0x186 = Termina Field
>> 0x188 = East Clocktown (next to Mayor's Residence)
>> 0x18A = West Clocktown (top part)
>> 0x18C = North Clocktown
>> 0x18E = West Clocktown (bottom part)
>> 0x190 = Laundry Pool
>> 0x192 = East Clocktown (next to Shooting Gallery)
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> West Clocktown
>> 0x1A0 = Termina Field
>> 0x1A2 = South Clocktown (bottom part)
>> 0x1A4 = South Clocktown (top part)
>> 0x1A6 = Dojo
>> 0x1A8 = Curiosity Shop
>> 0x1AA = Trading Post
>> 0x1AC = Bomb Shop
>> 0x1AE = Post Office (6C4F = Door Rotation)

Eight in West Clocktown.
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Clocktown (Sub rooms):
> Milk Bar
>> 0xCC = East Clocktown
> Post Office
>> 0xB4 = West Clocktown
> Bomb Shop
>> 0xAC = West Clocktown
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> Termina Field (Ten Exits)
> 0x1EC = North Clocktown
> 0x1EE = Southern Swamp Entrance
> 0x1F0 = Great Bay
> 0x1F2 = Snowhead
> 0x1F4 = Ikana Trail
> 0x1F6 = Milk Road
> 0x1F8 = South Clocktown
> 0x1FA = East Clocktown
> 0x1FC = West Clocktown
> 0x1FE = Astral Observatory

Zscene offsets 035CE040 - 03606590
Zmap offsets 036065A0 - 0362EE00

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> Inside Goron Village:
>> 0xEC = Outside of Goron Village
>> 0xEE = Goron Store
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> Goron Village Store:
>> 0x8C = Inside Goron Village
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> Blacksmith
>> 0xAC
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> Goron Racetrack
>> 0xCC = Goron Village
>> 0xCE = Start Goron Race
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> Music Box House
>> 0xAC = Ikana Canyon
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> Romani Ranch
>> 0x1D0 = Milk Road
>> 0x1D2 = House
>> 0x1D4 = Glitched Collision Between House and Barn
>> 0x1D6 = Barn
>> 0x1D8 = Baby Cuccoo Place
>> 0x1DA = Puppy Racing
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> Gorman Racetrack
>> 0xFC = (Place where Gorman Brothers stand) (to part of Milk Road closest to Termina Field)
>> 0xFE = (Other part that is fenced off) (to part of Milk Road closest to Romani Ranch)
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> Milk Road
>> 0x110 = Termina Field
>> 0x112 = Romani Ranch
>> 0x114 = (Part that is fenced off at Racetrack) (at part of Milk Road closest to Romani Ranch)
>> 0x116 = (Gorman Brothers stand at Racetrack) (at part of Milk Road closest to Termina Field)
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> Zora Hall
>> 0x1BC = Underwater Hole
>> 0x1BE = Outside of Zora Hall
>> 0x1C0 = Zora Store
>> 0x1C2 = Room with Star above Door
>> 0x1C4 = Room with Coral above Door
>> 0x1C6 = Room with Octopus above Door
>> 0x1C8 = Room with Sand Dollars above Door
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> Deku Palace Throne Room
>> 0xDC = Outer Deku Palace
>> 0xDE = Secret Entrance from Deku Palace Maze
>> 0xE0 = Glitched Collision (For cutscene, maybe?)
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> Great Bay Coast (main part)
>> 
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> Marine Research Lab
>> 0xB4 = Great Bay
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> Fisherman's Hut
>> 0x8C = Great Bay
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> Great Bay Coast (other part with a link to Zora Hall)
>> 0x170 = Great Bay Coast (main part)
>> 0x172 = Zora Hall (back entrance (underwater))
>> 0x174 = Zora Hall (main way)
>> 0x176 = Swim too far out
>> 0x178 = Beaver Race
>> 0x17A = Great Fairy's Fountain
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