tModLoader

Dig, Fight, and Build your way through the world of player-created mods on Terraria with tModLoader — this DLC makes modding Terraria a reality!

tModLoader (TML) is an open-source, community-driven modification and expansion of the Terraria game that makes it possible to make and play mods. TML expands your Terraria adventures with new content to explore created by the Terraria community! TML allows players to create and play Terraria mods and is designed in such a way so that you can play alone or together with friends — with one mod or with multiple, choose to play however you like!

NOTE: It is required that all your friends also install TML if you want to play together; it is not possible for vanilla users to play with TML users.

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SUPPORT
Looking for some help? You can receive support on our forum thread on Terraria Community Forums or our Discord server! These are our best places to get support, and they are both linked directly from our Website, which you will find below on our Steam Store Page.

tModLoader is an open-source project. This means the code is publicly available and anyone can make contributions to the project. Our project can be found on Github, linked via our Website.

Do you want to learn more about the inner workings for tModLoader? Maybe you want to use tModLoader right now? You can get started with our guide for players linked below on our Steam Page under "View the Manual. There are also pages for developers and contributors. Our wiki is filled with guides that learn you how to mod using tModLoader.

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FAQ
Here are some important things to know when you Install and get ready to dive into tModLoader:

You do not have to make any backups
Simply update Terraria to 1.4 and install tModLoader on Steam
You can play vanilla Terraria 1.4 and TML 1.3.5 alongside each other; tModLoader through Steam is treated as a separate game.
tModLoader for the 1.4 version of the game will come at a later date.
Steam Workshop is not supported as of yet, but is planned.
The Mod Browser will exist just as it is now, and we will not force Steam Workshop use
You can still use the 64 bit variant of tModLoader, but only as a separate installation
With the new release, tModLoader can be installed anywhere regardless of location or whether it is a Steam install.
tModLoader will work for Windows, Mac and Linux

How will this affect me? Will my mods still work when Terraria 1.4 is released?
When the Terraria 1.4 update happens, your current Terraria install will automatically update to 1.4, thereby making any current non-Steam tModLoader install unable to load due to these version differences.

To fix this, simply install tModLoader via Steam! tModLoader on Steam is installed independently from Terraria, with a separate entry in your Steam library, allowing you to switch between Terraria and tModLoader just by launching the version of the game you wish to play. Your mods, players, and worlds will all still be there.

Does this mean tModLoader has updated to 1.4?
No, that is still to come. tModLoader on Steam means tModLoader (on 1.3.5) and Terraria (on 1.4) will coexist without any effort from the user.

I currently use tModLoader 64 bit, how will that work?
tModLoader on Steam is launching with the 32 bit version of the application. We are still discussing potential ways to bring 64 bit along perhaps sometime in the future.. At the very least, you’ll should be able to manually install 64 bit over regular tModLoader as you have up until now. (It’ll just be in the tModLoader folder now, instead of Terraria)

What about Steam workshop support?
Steam Workshop is planned, but won’t be part of the initial release.