MTS2:Creator Guidelines/Sims 3 Game Mods

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Sims 3 Game Mod Upload Guidelines

When uploading game mods to Mod The Sims, we have some basic requirements to ensure that your upload is good, shown well, and has the correct info and files needed for people to use it in their games. This allows both moderators to check your uploads for quality, and for downloaders to see if your item is something they want to add to their games.


  • Tuning Mods - Versions: Whenever possible, tuning mods should be done in different flavours. For example, don't just double a value, but offer it half, tripled, and none. This is both due to the ease of making multiple flavours, and to make it easier for downloaders to find a flavour they want to use in their games. If you have a good reason for doing one specific tuning value rather than flavours, make sure you state it in the text of your post.
  • Usefulness: Your mod should be useful to the player and do not repeat functions available through game cheats. For example, buy pricing mods or mods that unlock items available in buydebug add no value as they are already available or the player can use motherlode.


You will need to include certain information. Some of these are only applicable for certain types of mods:

  • Mod Function: State clearly what your mod does. What is it for? What does it change in game? Where should they expect to see the changes? You need a good description of exactly what it's for and what it does.
  • Mod Type: State clearly what kinda mod your mod is. Is it a resource override (aka default replacement), recategorizer or hider, slider, XML tuning, or a full script mod?
  • Tuning Mods - List values: List the default values and what you changed them to. Example: "The default chance of this is set to 1.0 - I have with this value set to 2.0, 1.5, 0.5, and 0.1."
  • Special instructions: If your mod needs something extra to install/use, please add an instruction on how to install/use your mod. This is especially important for .ini file mods!
  • Post formatting: Please format your description in a readable format. Lists, headings, and proper use of bold text where appropriate is a lot easier to read and follow than a giant block of text.
  • Conflicts: Please list out any known conflicts and state with what kind of other mods your mod may conflict.
  • Overrides - Overriden Resources: If you have overriden (default replaced) an item, make sure to clearly state what you've overriden. The resource name itself is helpful to include, though not absolutely necessary.
  • Built with Game Version: Please state the related base game version you built your mod with in your upload post! People need to know if they can run your mod in their game. If you made sure that your mod is compatible with other game versions as well, you can, of course, list those too.
  • Slider information: If you have made one or more custom sliders, then you must list in which area of the sliders panels they can be found, what age(s) and gender(s) they're for, and what they're called in-game. Example: "This slider is for young adult and adult males and females, shows up in Eyes > Eyebrows and is called 'Thumb Length'"
  • Updates and Remixes - Credits: If you have uploaded a remix or update of someone else's mod, you need to credit the original creator and link to the original upload. Please add the creator's name, and a clickable link to the page where the original mod can be found, or (if the original page is down) the creator's profile or website.


You must have some sort of picture: To get your upload to show in the Downloads section on MTS, it has to have at least one image attached to the thread. If you can, try to get an in-game picture that is somewhat illustrative of the thing you're changing (if you're doing to change the behavior of vampires, a picture of a vampire would be a good choice), but at least go with something vaguely related (a picture of plumbbob would be far preferable to a picture of your dog).

If your mod adds new sim animations please also refer to the guidelines for poses and animations, specifically the paragraph under Screenshots regarding "pose animation".

Keep the following in mind for your screenshots, especially the required ones:

  • Size: 800 pixels wide by 600 pixels tall is a good size for the smallest pic you would want to upload. Your images can be up to 2560x1440 pixels, and 800 kb, so you have lots of space to work with!
  • Lighting: For most things, it's best to take pictures in an interior room with good lighting. For lots, pictures should be taken during a nice sunny day, for floorplans, take the pictures with the lights ON.
  • Clarity: Neither blurry, nor pixellated/crunchy. Do not size up small pictures to make a large one as this will blur them, and make sure not to use too much compression/too low quality when saving your images.
  • Distance: Take your pictures so that your creation fills the screen without anything cut off at top or bottom - neither zoomed in too close, nor zoomed out too far.
  • Distortion: If you resize your images, retain the aspect ratio so they don't get stretched or squashed. Take care when zooming in and out with the camera that you do not create a fisheye effect on your pictures.
  • Photoshopping: Do not apply filters like sharpen, contrast, etc. to the required pictures, as downloaders want to see what your creation will look like in their game, not your skills at using Photoshop.
  • Attached: All required images must be attached directly to the MTS upload, not just inserted using the img tag, so that even if the pics get deleted from your Photobucket (or other host), the upload on MTS is still complete.
  • Show all items: For most areas, if you are uploading a set, you must take all the required pics for each item in the set. If there is an exception, it will be noted.
  • Picture limit: You may upload up to 100 pictures for a single upload thread, so feel free to add some additional pictures just to show off your work to its best. Of course, keep it reasonable - nobody needs 50 pics to show off one sim or hair.
  • Inline pictures: Inline pictures are those that use the [img] tag to show up in with the description text. So that it doesn't take too long to load, please keep this to no more than 4 pictures done inline, unless you put them inside an [infobutton] tag. To do this, see our guide on post formatting.


  • Right files: Mod files must be in .package format. Do not upload a simple xml, obj, or other game format.
  • Essential Files only: Your upload should not be cluttered with extra files that it doesn't need to work, such as resource.cfg, a full subfolder structure, or a complete cloned object for one resource override. Please just stick to the essential files, as simply as possible.
Zip, Rar, or 7z
To upload your file(s) to MTS, you will need to compress them into an archive file, which makes them smaller and allows you to include many files in one download. The archive file formats we currently accept are .zip, .rar, and .7z.

For instructions on compressing your files into an archive, please see: Creator Guidelines: Creating Archive Files.

  • Do not include multiple archives with the same contents - that is, please don't put your files in both a .zip as well as a .rar because some people only want .zip files. Choose one format.
  • Do not double-compress your files... a .rar file inside another .rar file (or any other archive inside another) doesn't compress it anymore, and it makes it so we can't see the contents without downloading, and also just makes an extra step for the people downloading.
  • The file size limit on MTS is 50 mb. If you exceed this limit you will need to split your archives. This should probably never come up except for large worlds for The Sims 3, or huge sets of smaller items.


Upload in sets
If you have created several mods in a set, or similar mods in the same sort of theme at the same time, please upload these together in a single set, all on one thread (instead of all separately, one by one, on different threads). This is easier for everyone: on our upload moderators, as they only have one thread to review rather than several... on you, as submitting a single thread is much quicker and easier than several... and on downloaders, as they can get everything they want all in one place rather than having to hunt around.
Uploads not allowed on MTS
These items are not allowed on MTS in any category.
Pay/Pirated Content

Everything required or recommended for an upload must be freely available, without having to pay.

  • No uploads requiring pay content: We do not host content (for example, recolours of a pay hair or object mesh) that absolutely require pay content to function in-game.
  • No optional pay, pirated, or stolen content: Even for optional or recommended content not absolutely required for the creation to work (for example, hair on a sim or a couch on a lot), this means:
    • No content you must pay for. This means you cannot use items that are pay, donation, subscriber only, "special gift", etc. type content, anything accessible only when you pay money or subscribe.
    • No content from sites that are repositories of unmodified content when it is still available from the original creator, whether these items are pay or free (no Booty or Simscave, torrents, sites full of stolen content or similar, but the Graveyard and sites that offer recolours or modifications with the mesh are okay).
    • No EA content simply converted to base game use with no other changes.
    • No pirated EA Store content. EA Store content, linked to the legitimate EA Store, is okay though. TS2 store content may be included, with proper credit, since the store is no longer available.
Other content not allowed
  • Items that belong on the adult site: No content posted on MTS can have visible nudity, sexual content, or adult content, and instead must be posted on our adult site, Sexy Sims. This means on MTS, you may not post:
    • Content that contains nudity, which we define as exposing the female nipples, or the butt crack/genitals of either gender, including semi-transparent stuff like a sheer bra. Items that are merely "sexy" like skimpy miniskirts or string bikinis are fine on MTS. Transsexual/transgender items are also not considered adult content unless they contain nudity.
    • Skintones containing genital details - female nipples are okay on MTS but see below regarding screenshots.
    • Images of skintones with uncensored female nipples. Please blur or cover the nipples, butt crack, and genital area when taking screenshots of your skintones.
    • Fine art uploads containing visible nudity.
    • Items with specifically sexual content (sex toys, sexual poses).
    • Items containing swear/curse words
    • Items relating to illegal drugs. Prescription and over-the-counter drugs, alcohol, and tobacco are okay on MTS though.
  • Sexualized children: We do not allow any sexy/sexualized content for baby, toddler, or child sims in any way - no breasts whatsoever on child sims, no "sexy" outfits, etc. If you want to make preteens, make a less developed body for teen sims. Sexualized child content is not allowed at our adult site either.
  • Offensive content: Racist, sexist, homophobic, transphobic, bigoted, hateful or otherwise offensive content will not be allowed. Again, also not allowed at our adult site.
  • Gore/violence: We do not allow uploads which feature prominent, graphic violence and/or gore. Examples of things we do not allow would include items centred around mass shootings, images showing explicit violent imagery, cannibalism, and infanticide. Limited violence and gore may be featured if not the dominant focus of the upload, and not excessively graphic. Think a PG-13 movie. If uncertain whether your upload crosses this line, we suggest making a thread in the Creator Issues forum asking for feedback from a moderator before uploading.
  • EXE installers: Creators are not allowed to post exe (or other executable) files for any area of the site but Modding Tools. If your content needs to be installed to a certain directory, you can compress your files and leave the directory structure intact, so you can tell people to just install to Program Files, for instance, and the files will go where they need to. Executable installers can easily hold viruses, and are generally not needed for installing most content.
  • Preorder bonus content: Certain items were only available if you preordered certain expansions or stuff packs from certain retailers. It's unfortunate if someone missed out on getting them, but they can't be redistributed here as EA has made it clear that they do not allow it.
  • Unmodified EP/SP/Store content: While it is common practice to modify and use bits and pieces of game content to create custom content, extracting content from an expansion, stuff pack, or Store item and uploading it unmodified is not allowed on this site. You are welcome to upload significantly modified versions of expansion, stuff pack, or Store content, but you can't just be ripping it and changing one tiny thing (or nothing) just so people who didn't purchase it can still use it.
  • Stolen/reuploaded content: This should go without saying, but do not upload content made by others and claim it as your own, in whole or in part. Don't upload the work of someone else without their permission... if they wanted to share it at MTS, they can easily upload it here themselves.
  • Uncredited content/violating permissions: If any part of what you have uploaded (mesh, textures, alphas, bump maps, coding, etc.) comes from somebody else's work, you MUST provide a link and credit in the text of your post, for the original author. State what you've used of theirs, the author's name, and give a link back to them. You must check the author's policies to see if you can use their content in the way you want, and you may not violate any policies stated. If there are no policies or they don't disallow your type of usage, or the site is permanently offline, then you can assume it's okay. Please see here for more details: Updates and Remixes of Creations.
  • Redirects: If you want to move a creation to another site, please remove your upload from MTS, don't just edit the text to point to a different site.
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