Description
MultiWorld for Minecraft Forge 1.5.1 or 1.5.2 or 1.7.2 or 1.7.10
Latest version is 1.2.7 and fixes crash in full overworld types.
MultiWorld, a basic but functional Forge Dimension Provider. Create one or more custom new dimensions. Gives a choice of different worldTypes, and adds a custom one with a choice of any number of biomes. Also allows old world saves to be imported as a dimension.
WIKI guide relocated to the page tab above.
A forge mod for use with Minecraft 1.7.2 with Forge installed. For a 1.5.2 version of this mod, see Too Many Biomes

A dimension created using biomeCommands=allow:3,15,164
Extreme Hills (left top), Mushroom Island Shore (middle), Savanna Plateau M (top right)
Chat shows results of /multiworld 3 command to get info on this dimension (which is 3)
Configuration
The Config folder inside Minecraft contains the file MultiWorld.cfg which is easily edited with any form of text editing program, eg notepad
options.dimensions how many extra dimensions you want this mod to add (defaults to 2)
options.providerId Provider ID, in case another mod conflicts (default 21)
worldTypeMW WorldType ID , in case another mod conflicts (default 7)
There is also a block of settings for each dimension generated
biomeCommands allow:*; to add all biomes.
By listing their biomeIDs you can choose which ones you want, allow:3,0; would only add ExtremeHills and Ocean Biomes.
dimension_ID Stores which dimension is used, will auto configure to avoid conflicts.
isFullOverworld Use Overworld style world spawn and pre-generation of chunks (default false)
name Allows you to name your dimensions (default is DIMx where x is the dimension_ID)
worldType this is where you choose what worldType you want, see table below (default is mw:multiBiome)
known worldTypes
MWmultiBiome MultiWorld
BOP Biomes O Plenty
flat Minecraft flat world
default Minecraft overworld
largeBiomes Minecraft large biomes (as used on Minecraft servers)
amplified Minecraft amplified
default_1_1 Minecraft
Commands
To assist, a few chat commands have been added.
/listBiomes Lists all known BiomeIDs, and their names. Add a number to the end to display the list one page at a time.
/multiworld List all dimensions generated by this mod, if you add the dimensionID it will list more info (eg /Multiworld 2)
/tpd x Teleport to the spawn point dimension x, which x is the dimensionID.
known bugs
Beds work in dimensions created by the mod, however they don't set it back to day.
Sometimes spawns underwater, which is a problem when its a Deep Ocean biome.
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What means Verified?
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Compatibility: The mod should be compatible with the latest version of Minecraft and be clearly labeled with its supported versions.
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Functionality: The mod should work as advertised and not cause any game-breaking bugs or crashes.
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Security: The mod should not contain any malicious code or attempts to steal personal information.
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Performance: The mod should not cause a significant decrease in the game's performance, such as by causing lag or reducing frame rates.
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Originality: The mod should be original and not a copy of someone else's work.
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Up-to-date: The mod should be regularly updated to fix bugs, improve performance, and maintain compatibility with the latest version of Minecraft.
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Support: The mod should have an active developer who provides support and troubleshooting assistance to users.
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License: The mod should be released under a clear and open source license that allows others to use, modify, and redistribute the code.
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Documentation: The mod should come with clear and detailed documentation on how to install and use it.
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How to Install
Download Forge & Java
Download Forge from the offical Site or here. If you dont have Java installed then install it now from here. After Downloading Forge you can run the file with Java.
Prepare
Lounch Minecraft and select your Forge istallation as Version this will create a Folder called Mods.
Add Mods
Type Win+R and type %appdata% and open the .minecraft Folder. There will you find your Folder called Mods. Place all Mods you want to play in this Folder
Enjoy
You are now Ready. Re-start your Game and start Playing.