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Undefined Lost World (Official)(DISCONTINUED)

Undefined Lost World (Official)(DISCONTINUED)

MOD
Don't let them watch and catch you, they will find your place and your belongings.
by Flenum
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5,752 downloads
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Updated Oct 14, 2026
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Addons Adventure and RPG Dimensions Mobs World Gen
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Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

Undefined Lost World

    

UNDEFINED LOST WORLD (OFFICIAL)

 

Description

Mod with hidden features, features that can be unexpected, features that take time, features that are triggered by the player, features are only available for single player, while it is for single player, this mod can support multiplayer although funky, may lag your game if it does let me know, or run "/forge tps" or something like this. If the mod has bugs and it's annoying or repeated events let me know, i will continue this mod and i care about my players, give me ideas and lastly, this mod is best played with the broken script.

 

This mod was and is still being made through out a week, mod is under development. Patience for this mod can be rewarding because this mod is a really slow burner, events happen with chance, the more you do the more it does.

  

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Events:

Player can get jumpscared by sounds

by entity,

random player joins,

random noises,

random block placements,

random structures,

random music,

random ambiance,

random ambiance

events. 

 

Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-07-13 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-26 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-26 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-22 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-20 Get
Undefined Lost World (Official) (Updated, Balance changes)
MC Client, 1.20.1, Forge, Server
Release 2025-05-12 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-12 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-10 Get
Undefined Lost World (Official) RUN update.
MC Client, 1.20.1, Forge, Server
Release 2025-05-09 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-09 Get
Undefined Lost World (Official) (Active Update!)
MC Client, 1.20.1, Forge, Server
Release 2025-05-09 Get
Undefined Lost World (Official) (Fixed)
MC Client, 1.20.1, Forge, Server
Release 2025-05-09 Get
Undefined Lost World (Official) (FIXED)
MC Client, 1.20.1, Forge, Server
Release 2025-05-09 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-08 Get
Undefined Lost World (Official) (BIG update)
MC Client, 1.20.1, Forge, Server
Release 2025-05-08 Get
Undefined Lost World (Official) (BIG release)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official) (Fixed spawn-rate and randomness)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official) (Added Biome with custom Music)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official) (Added and fixed randomizer)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official)
MC Client, 1.20.1, Forge, Server
Release 2025-05-06 Get
Undefined Lost World (Official) (Official Release)
MC Client, 1.20.1, Forge, Server
Release 2025-05-05 Get

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