🔬
What Can Be Modded
👗 Custom Clothing
New body skins and outfits for all skin tones and body types. Each outfit is a complete body texture – tops and bottoms are combined.
💇 Hair & Heads
New face textures and hairstyles – hair is painted directly onto the head skin texture, not a separate item like later games.
🪑 Objects & Furniture
New .iff objects with custom interactions, prices and behaviour. From hacked chairs to entirely new functional items.
⚙️ Gameplay Hacks
New careers, new interactions, QoL improvements and need fixes. All achievable through standard .iff modding – the community has been doing this since 2000.
🏠 Walls & Floors
Custom wall coverings and floor tiles using the official Home Crafter tool. Import any image and generate the game files.
🐛 Bug Fixes
Community patches for vanilla game bugs not fixed by EA – pets, careers, expansions, and more.
🎮 Steam Deck
Confirmed working. The Legacy Collection runs well on Steam Deck according to consistent community reports. The smaller screen size actually suits the original Sims 1 resolution well. Standard mod install paths apply – find your Steam install in the Deck's file manager at the same location as a Windows Steam install.
✅
Now Possible – Requires Mods or Patches
These were previously limited but the community has found solutions
Change Sim appearance (face/hair/skintone) in live mode
Now possible via FaithBeam's Sims 1 Legacy Collection Hacks ↗, which patches the game in memory at runtime to unlock the hidden
edit_char debug cheat. Run the tool before launching the game and keep it open while you play – Sims.exe is never permanently modified. Typing edit_char in the cheat console then opens Create-A-Sim in live mode. Works on Steam and EA App. See the Debug Tools section for setup details. Without the patch, the original workaround still applies: use The Sims Creator to edit skin files outside the game then reload your save.Children aging up
Now possible without Makin' Magic. Using FaithBeam's Sims 1 Legacy Collection Hacks ↗ to unlock the
edit_char cheat, combined with a birthday cake mod that enables ageing, children can be aged up to adults in any game configuration. Previously the only built-in method was the "Age of Instant" charm in Makin' Magic, which aged the child but fully randomised their adult appearance. The new method gives you control over the result.⚠️
Possible with limitations
These are possible, but are limited, cannot work with certain configurations, etc.
Teen life stage (children → teens → adults like Sims 2)
Possible for non-legacy versions of The Sims 1 with SimLifecycle ↗, a utility ran outside of the game to age child sims into teenagers, then into adults, and allowing them to move out. The utility also installs custom skins for teenage sims as well as a high school career track that replaces the Criminal track. Doesn't seem to work with Legacy as the installer seems to be geared to work with how non-Legacy is installed.
Buildings with more than two stories
Possible with Simitone, an open source alternate frontend for the game. However, Simitone is still in development, and Simitone game files will be seperate from the base game. The original version can be downloaded here ↗ although at the time of writing (Apr 8th 2026), this does not work with Legacy. A forked version not affliated with the official Simitone team that does work with Legacy can be downloaded here ↗
❌
Not Currently Possible
Toddler and Elder life stage
The Sims 1 engine has only three life stages: Baby, Child, and Adult. Teen stage can be introduced with SimLifecycle utility as explained above, but the utility only works with non-legacy versions. Adding other lifecycles would likely require implementing a method similar to SLC or would require modifying the core game executable (sims.exe), which is encrypted in the Legacy Collection. For full generational aging, The Sims 2 Legacy Collection (included in the same bundle) has the complete system.
Camera scrolling with dual monitors
On a dual-monitor setup, moving the mouse to the edge of the game screen pushes your cursor onto the second monitor instead of scrolling the camera. This happens in both windowed and fullscreen modes – the game can't tell the difference between "edge of screen" and "moving to next monitor". Workaround: use the arrow keys, right-click and drag, or Alt + mouse to move the camera instead of edge scrolling.
Mods that patch sims.exe
Some old mods for the original game patched the executable directly. The Legacy Collection's sims.exe is encrypted – these mods cannot work in Legacy.