MTS has all free content, all the time. Find out how YOU can help to keep it running. Tell me how...


by Crowkeeper Posted 15th May 2020 at 5:09 PM - Updated 5th Oct 2020 at 5:17 PM by Crowkeeper
55 Comments / replies (Who?) - 4 Feedback Posts, 21 Thanks Posts
This is a featured upload! It showcases the best talent and creativity available on MTS and in the community.

Welcome to the realm of Mermaidia
The realm of Mermaidia is hidden behind a veil of endless waves, deepest sea and fog so impenetrable, that not a single sailor has ever entered its shores. The realm is flourishing under the watchful eye of Saela - Goddess of all Waters. The lives of all Mermaidians are guided by magical rituals and ancient customs.

World Details

Population: unpopulated
Size: 1024x1024 - medium
World Type: Base (suburban)
Number of community lots: 18 (plus 6 dive lots)
Number of residential lots: 14
Diving and tomb adventures included
File size: ca. 49 MB

Number of layers: 8 plus Global Layer
Number of terrain textures: 15 on some chunks I used more than the recommended 8 per chunk but that shouldn’t be a problem.
Most parts of the islands are routable but the sea can be entered only from specific spots to limit water taxi usage and to avoid lags.

  • All BG fish spawners
  • All seashell spawners
  • All BG harvestable plants can be found on lots
  • All turtle spawners
  • Most BG, WA and LN gem spawners
  • Most BG and WA metal spawners


Required Expansions: All Expansion packs, No store content, no Stuff Packs required
Built on patch level:

Required CC

Mermaidian subway (included in the download, please don't forget to put it into your mods (packages) folder) - Custom CC for Mermaidia by the amazing Ladyatir

- Jynx’ rabbithole rugs (pets fixed) for Business and Journalism, Hospital, Science, Bookstore, Grocery, Graveyard, Town Hall, Diner and School from here:, post #6, you only need the basegame ones. (It is very important to download these specific rabbit hole rugs I have linked to. Others won’t work even if they have the same name! You will know you have the correct files installed if there are correct lot tags displayed on the map).


Caitie's Mermaid Hunger and "Drying Up" Moodlet Tweaks:

Many of the community lots are combo lots with a specific lot type (e.g. Library) and a rabbithole rug. The RH rugs overwrite the lot type map tags in these cases. The lots work fine, the specific lot map tags just do not show in map view. If that bothers you this will help: map tag fixes by Don Babilon

Things to note about Mermaidia
  • Mermaidia is a roadless world. It may take some time until the sims have reached their destination.
  • The world comes with custom lighting/weather. So if you have a global lighting mod you might want to take it out to see how the world is meant to look.
  • EA tends to spawn collectibles for all EPs you have installed. So you might find e.g. small pets in inconvenient places. If you want to prevent small pets from spawning you could try this mod:
  • Many of the characteristic features of the buildings were achieved with the cfe cheat and editing of the lots is not advisable.
  • Skip level markers have been used and you will have to enter the: "RestrictBuildBuyInBuildings off" cheat to edit the buildings.
  • Mermaidia uses custom textures and weather so it is highly recommended to quit the game and reload if you want to switch worlds. Weather or textures may bleed into the next world. It will be ok after saving and reloading. This is not an issue with Mermaidia but EA default.
  • Snow doesn't look right on the Mermaidian land due to it's sculpting (the land level being extremely close to the sea level). It is recommended to switch off all seasons except summer.
  • The diving lots can trigger unexpected errors (e.g. swimming on land) This is not an issue with Mermaidia but EA default. You will most likely have to reset your sim if you experience such issues.
  • Most parts of the islands are routable but the sea can be entered only from specific spots to limit water taxi usage and to avoid lags.
  • Mermaidia contains tombs some of which can lead your sim to premature death. It is recommended to create a separate save file before entering them.
  • There are many rubble piles used as decoration in Mermaidia so if your sim is saying they can't remove them you should skip them.


First of all, I would like to thank the amazing tomb makers who have made Mermaidia a much more fun place to play: Kylaaab, Chokolady and Celtysims

Ladyatir for creating amazing additions for the world - her subway replacement and the water taxi replacement (already included in the world file)

Nemexia of the nightfall, Willowsblood and Windermere for creating beautiful sims for the artwork in Mermaidian's gallery.

Simsmidgen , for dedicating countless hours to testing every version of the world and patiently replaying all dive lots and tombs again and again.

attuned, Bbcopperdaisy, and Frou , who tested the world, provided helpful advice and support!

I would also like to thank the creators of the following mods:
Decorator's Best Friend by misukisu:
NRaas Debug Enabler:
Velocitygrass' stencil remover:

Also a big thank you to the many more who offered their help!

But the greatest thanks belongs to my dear friend Norn, who did not only come up with the whole idea of making a Mermaid themed world (proof ) but created beautiful crystal trees for it and helped me through the whole creative process, taking care of the routing, discussing every detail with me for hours and motivating me to finish the project even when I felt like it is impossible. So if you want to thank someone for this world, it should probably be her.

You must have the expansion or stuff packs listed below installed to use this custom content. Please see the post text for any exceptions.

Sims 3 World Adventures Ambitions Late Night Generations Pets Showtime Supernatural Seasons University Life Island Paradise Into the Future
Key: - File was updated after upload was posted
Filename - Tip: You can click the magnifying glass to see the archive contents Size Downloads Date

Size: 80.33 MB · Downloads: 5,647 · 15th May 2020
80.33 MB 5,647 15th May 2020
Don't forget to Thank the creator after downloading! Use the Thanks button located above the screenshots above.
Quick Guide:

1. Click the file listed on the Files tab to download the file to your computer.
2. Extract the zip, rar, or 7z file. Now you will have either a .package or a .sims3pack file.

For Package files:

1. Cut and paste the file into your Documents\Electronic Arts\The Sims 3\Mods\Packages folder. If you do not already have this folder, you should read the full guide to Package files first: Sims 3:Installing Package Fileswiki, so you can make sure your game is fully patched and you have the correct Resource.cfg file.
2. Run the game, and find your content where the creator said it would be (build mode, buy mode, Create-a-Sim, etc.).

For Sims3Pack files:

1. Cut and paste it into your Documents\Electronic Arts\The Sims 3\Downloads folder. If you do not have this folder yet, it is recommended that you open the game and then close it again so that this folder will be automatically created. Then you can place the .sims3pack into your Downloads folder.
2. Load the game's Launcher, and click on the Downloads tab. Find the item in the list and tick the box beside it. Then press the Install button below the list.
3. Wait for the installer to load, and it will install the content to the game. You will get a message letting you know when it's done.
4. Run the game, and find your content where the creator said it would be (build mode, buy mode, Create-a-Sim, etc.).

Extracting from RAR, ZIP, or 7z: You will need a special program for this. For Windows, we recommend 7-Zip and for Mac OSX, we recommend Keka. Both are free and safe to use.

Need more help?

If you need more info, see:
55 Comments / Replies (Who?) - 13 Feedback Posts, 41 Thanks Posts
Hide Thanks Posts for this thread (Show only feedback)
Page 2 of 3
Test Subject
#26 Old 16th May 2020 at 8:00 PM
Wow, beautiful! I cant play it because I dont have all the EPs, but it looks amazing.
Test Subject
#27 Old 17th May 2020 at 3:33 AM
I'm impressed, this is completely mindblowing! I don't even play TS3
Test Subject
#28 Old 17th May 2020 at 5:01 AM
So beautiful! Been following the progress for months. So happy to see the culmination of all your hard work <3
Forum Resident
#29 Old 17th May 2020 at 10:30 AM
Great job, its an absolutely stunning world
Mad Poster
#30 Old 17th May 2020 at 2:28 PM
So freaking cool!
Test Subject
#31 Old 17th May 2020 at 7:11 PM
You have created a MASTERPIECE! :o This world is absolutely breathtaking!
Lab Assistant
#32 Old 17th May 2020 at 9:30 PM
I think this is truly the most beautiful world I've seen. The artistic talent to make this is off the charts. I'm making a video tour!
Original Poster
#33 Old 18th May 2020 at 1:24 AM
Thank you so very much for the beautiful comments. You made me incredibly happy

Amazing. Seems inspired by PWI Raging tide expansion, am I right?

I have never heard about that before but it looks interesting

Visit my Tumblr for more creations :)
Test Subject
#34 Old 19th May 2020 at 4:46 PM
Been a member of this website for like 15 years and I believe this might be the first comment I've ever left. I just had to thank you so much for creating this absolute masterpiece. I'm so freakin' obsessed with merfolk and this is beyond astounding.... I just loaded it up in my game and it's a mermaid fantasy come true! I'm sure I'm will be using this world for years to come. This is literally now my top favorite sims mod ever! Thank you, thank you, thank you for all the hard work you all did on this! In the midst of this pandemic with so much scary stuff happening right now, having this beautiful virtual mermaid world to escape into really means a lot! <3 -MerMatt
#35 Old 20th May 2020 at 9:28 PM
Absolutely stunning and posted on my birthday which I see as a beautiful birthday gift lol Words fail all I can do is reiterate what other posters have written which is awesome, beautiful and so creative I am going to have so much fun playing in this world. Thank you from the bottom of my sims 3 heart!
Test Subject
#36 Old 21st May 2020 at 4:28 PM
(aka-Bbcopperdaisy) OMG, just saw the YouTube video of Mermaidia! So excited it's finally here! (Yes, I've been out of touch for a while.) I am very honored that I was able to help out with some final testing and am looking forward to seeing the end result. I fell in love with those gorgeous, underwater-looking skies, all the "floating islands" around the world...and those ADORABLE jellyfish bushes that are everywhere. I can't wait to turn myself loose with all my mermaid-esque cc that I didn't allow myself to use before. Thanks to everyone who had a hand in making such a unique new world.
Lab Assistant
#37 Old 21st May 2020 at 7:46 PM
This is so unique!
Test Subject
#38 Old 24th May 2020 at 8:05 AM
This is awesome!!! Thank you!
Test Subject
#39 Old 27th May 2020 at 6:51 AM
Can't believe my eyes, this is an ultimate fantasy world!! Loves all the small details, the world is so poetic, artsy and cool!
Lab Assistant
#40 Old 28th May 2020 at 10:15 AM
I have followed your blog for quite awhile and have been waiting for this world for so long! I literally squawked with joy when I saw it up for download! I am so excited to play and this world looks FANTASTIC!
Lab Assistant
#41 Old 29th May 2020 at 8:02 AM
Astounding!! Utterly astonishing!! Thank you for sharing!
Test Subject
#42 Old 31st May 2020 at 1:19 PM
Simply amazing! This is truly a work of art! Thank you so much for sharing it. <3
Test Subject
#43 Old 31st May 2020 at 2:30 PM
I admit that I have been waiting for this particular world for so so so long. You have made my month! Now I'm tempted to work this into a Sims story I'm writing, with your permission, of course!
Forum Resident
#44 Old 19th Jun 2020 at 5:25 PM
You even made a map!!!! This is an amazing creation!!! Thank you so much!!! I love the detail of the map!!!
Test Subject
#45 Old 3rd Jul 2020 at 4:35 AM
Absolutely gorgeous, and a wonderfully small file size too :D
Test Subject
#46 Old 16th Jul 2020 at 8:18 PM
I really love your fantasy world creations, really <3 I download all your stuff always, you have so much talent
Test Subject
#47 Old 8th Aug 2020 at 8:45 PM
This world is gorgeous. I've been following your progress for a few years and I was so excited to finally see it completed. It looks great in game and I can't wait to play it.
Test Subject
#48 Old 30th Aug 2020 at 7:32 AM
I don't know how can I enjoy it more. Moving inside, or visiting the world?
This world is stunning! Such hard work. I am not too good complimenting, but this is amazing. I can't even imagine how much time you've spent making this world.
Lab Assistant
#49 Old 4th Oct 2020 at 9:14 PM
This is beautiful... Shame it requires all expansion packs, so I will never be able to play it. At least I can enjoy the pretty pictures, though!
Lab Assistant
#50 Old 4th Oct 2020 at 10:01 PM
Might I ask why this only shows needing base game when in reality it requires all of the EPs? Kind of misleading and confusing.
Page 2 of 3