A 64-bit engine mod for The Sims 3.
OpenTS3 is led by JJ, with eight other C# developers on the team. Together, we’re bringing The Sims 3 to a new 64-bit engine using your installed game’s content and original gameplay code. Vulkan and .NET 10 are in place; we’re now focused on performance, polish and broad playtesting.
There’s no public download yet. Playtesting information →
What we’re working on
OpenTS3 is being played as The Sims 3 in 64-bit. Cars, stairs, relationships, birth, aging and death are working in developer playtests, along with most Build/Buy tools and substantial Pets, Seasons and Late Night gameplay. We’re beyond Sunset Valley now, with Riverview, Appaloosa Plains and Bridgeport in testing. The focus is performance, optimization, shaders, audio and checking the many details that still need polish.
Read about OpenTS3 →- Access
- Free, always
- Requirements
- Your own installed game
- Release date
- Not announced
- Source code
- Will be open source; private for now
Since the last update
- Vulkan and .NET 10: a major engine and runtime refactor
- Playable everyday life: cars, stairs, relationships, birth, aging and death
- Most Build/Buy tools working, with remaining details and broad QA to finish
- Pets, Seasons and Late Night gameplay; Riverview, Appaloosa Plains and Bridgeport
- Launcher drag-and-drop for mods, custom content, Sims and saves
Current private development and developer playtesting. Working gameplay still needs broad QA; there’s no public download yet.
What changed and what’s next →How the pieces fit
More detail →Game content
Worlds, objects, textures, animation and sound.
Original gameplay code
The rules and systems behind Sims and their interactions.
The new engine
Loads and draws the world, implements engine systems, and connects them to the game’s existing code.
In developmentThe game files stay in your installation. OpenTS3 does not include The Sims 3 or unlock content you do not own.
Development notes
Road to release →Create a Sim & households
Households and pets can be created and moved in in tested cases. Pet coats, portraits and saved rigs have received further fixes.
Build mode
Most of the original Build/Buy toolset works. Remaining tools, visual details and complete-house QA are the next steps.
Save, quit & reload
Save/reload checks and original-world loading have progressed. The default save folder is now separate from The Sims 3.
JJ and eight other C# developers are working on OpenTS3. Updates and playtest announcements are shared in JJs Game Lab.
Join the conversation ↗Later, we’d like this to be a home for mod discoveries and compatibility reports, too. Plans for the community hub →