MTS2:Creator Guidelines/Majors/Sandbox

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When uploading a custom major for The Sims 2 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.


  • Theme: The subject matter of a custom major need not be within the realms of possibility. We have magic majors, hoodlum majors, majors on how to be a ninja... no sense of reality required. However, whatever theme you choose must make sense as a major.
  • Uniqueness and Grammar: Description, title, and classes must be new, unique, and interesting. They must also be double-checked for spelling and grammar. If you need help with proofreading, you can post a thread in the Creator Feedback Forum.
  • Clear All Languages: Make sure to hit "Clear All Languages" before you upload, or your file will not work properly with non-US English games!
  • Overwriting: Unless your major is specifically intended to overwrite a Maxis major, it must have a custom GUID.
  • Skill Requirements: If you use BCONs to alter skill requirements, test them thoroughly before you upload. Incorrectly modified BCONs can cause game crashes, so test them.
  • Custom Icons: Your icon should make sense for your career and fit reasonably well with the user interface.


  • Icon: You must include your major's icon, or a picture of it in-game.


Title & Description
Give your upload a descriptive title and write a text description for your upload, describing what you're uploading. Your title and description must be in English or provide an English translation. If you are not a native English speaker, using Google Translate is okay. You can also ask for help writing your description in the Creator Feedback Forum.
Required Information
  • You must include in your post:
    • Major title and description, and class names.
    • If the major overwrites a Maxis major, you must state which major it overwrites.
    • If you used BCONs to alter skill requirements, state which skills are focused on.
    • The icon used for the major, as an attachment to the post. If you created your icon in a program which uses lurid pink to show transparency, put it on a white background; otherwise it wont look good to downloaders.
    • Majors require University. They are not basegame compatible. They do not require Nightlife, Seasons, or anything else. Tick the University box, and that's it!
Expansions Required?

Majors require University. They are not basegame compatible. They do not require Nightlife, Seasons, or anything else. Tick the University box only!


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.


  • If your upload is rejected or marked as changes required and you're not sure why, ask in Creator Issues.
  • If you're not sure whether your major is ready for uploading, use the Creator Feedback Forum to get feedback on it.
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