How to Actually Use the Cas Full Edit Mode Cheat for Sims 4 Without Breaking Your Game

You've been there. You spend three hours building the perfect Mediterranean villa in Oasis Springs, move your Sim in, and suddenly realize their nose looks... well, let's just say it looked better in the gallery. Or maybe your Sim aged up from a toddler to a teen and inherited some truly questionable fashion choices and a chin that simply doesn't exist. You head to a mirror, click "Change Sim," and realize you're locked out. You can change the clothes, sure, but you can't touch the bone structure, the body weight, or those traits that are now ruining your storyline. It's frustrating.

That is exactly why the cas cheat for sims 4 is the most used command in the entire franchise. Honestly, the game feels incomplete without it. While most players know about testingcheats true, the actual "Full Edit Mode" is a secondary layer that a lot of people mess up because the game doesn't exactly give you a manual for it.

The Secret To Unlocking Everything in Create-A-Sim

Before you can do the heavy lifting, you have to tell the game you're in charge. If you just type the cheat into the console while you're already in CAS, nothing happens. It's a common mistake. You have to trigger the permission while you're in Live Mode—that is, while your Sims are actually walking around, ignoring the dishes, and waving at the ceiling.

First, pull up the cheat console. On PC, it's Ctrl + Shift + C. If you're on Mac, it's the same thing: Command + Shift + C. Console players, you aren't left out; just hold down all four shoulder buttons (L1, L2, R1, R2 on PlayStation or LB, LT, RB, RT on Xbox) at the same time.

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Type testingcheats true and hit enter. You should see a little notification saying "Cheats are Enabled." If you don't see that, the rest of this won't work. Now, here is the specific cas cheat for sims 4 that changes the game: type cas.fulleditmode and hit enter again. There won't be a confirmation message for this one. The game stays quiet. But now, when you Shift-Click (or press A+B/X+Circle) on a Sim and select "Modify in CAS," every single slider is unlocked.

You can change their walk style. You can change their voice pitch. You can even delete that annoying "Clumsy" trait and replace it with "Genius" without having to drink a Re-Retraiting Potion from the Rewards Store. It’s basically playing god, which is why we’re all here anyway.

Why Full Edit Mode is Different From Regular CAS

Normally, when you use a mirror or a dresser to "Change Sim," the game puts you in a restricted version of the editor. Maxis designed it this way to maintain the "integrity" of the life simulation. The idea is that your Sim's physical appearance and personality should be permanent consequences of their genetics and your choices. But let's be real—Sims 4 genetics can be chaotic. Sometimes a child grows up and looks nothing like their parents, or a random townie wanders into your neighborhood looking like a fashion disaster from the year 3000.

With the cas cheat for sims 4 active, those restrictions vanish. You get access to the "DNA" panel. This is where you can change a Sim's age group—making an Elder a Young Adult again—or change their biological relations. Ever realize halfway through a save that two Sims you created should have been siblings instead of roommates? This is the only way to fix that without starting a brand new save file.

Dealing with the Occult Transition

Things get a little weird when you’re dealing with Vampires, Werewolves, or Mermaids. If you use the full edit mode cheat to turn a human Sim into an Occult, or vice versa, the game can sometimes get "crunchy." I’ve seen cases where a Sim retains their human form but has the Vampire needs bar, or they turn into a Mermaid but their tail never appears in the water.

If you're going to use the cas cheat for sims 4 to change a Sim's species, it's usually safer to do it through the dedicated gameplay mechanics or specific occult cheats like traits.equip_trait trait_OccultVampire. Using the CAS menu to force an occult change is a bit like performing surgery with a sledgehammer. It works 90% of the time, but that other 10% involves your Sim T-posing in the shower for the rest of eternity.

Common Glitches and How to Avoid Them

One thing nobody tells you is that keeping cas.fulleditmode active for too long can sometimes lead to UI lag. If you find that your menus are taking forever to load or the "Save" icon is spinning indefinitely after you finish an edit, it might be because the game is struggling to register all the data changes you just made to the world's population.

Also, watch out for the "Relationships" tab. If you change a Sim's age from Child to Adult while in the cas cheat for sims 4 menu, you need to double-check their relationships with everyone else in the household. Sometimes the game gets confused and resets their spouse to a "Sister" or "Friend," which makes for some very awkward dinner parties once you go back to Live Mode.

The Console Warning

For those playing on PlayStation or Xbox, there is a massive caveat. Enabling testingcheats true—which is the prerequisite for the cas cheat for sims 4—will permanently disable Achievements or Trophies for that specific save file. You'll get a big, scary warning box. If you're a completionist who wants that Platinum trophy, do not hit "Yes." Once those cheats are on, there is no turning back, even if you turn them off later. The save is "tainted" in the eyes of the achievement system.

Making Townies Look Human Again

The best use for the cas cheat for sims 4 isn't even for your own Sims; it's for the NPCs. We all know the "Townie Fashion" meme is real. The game loves to generate NPCs wearing a top hat, a diving suit, and those eyeball rings. It ruins the immersion.

If you see a neighbor walking by who looks like they got dressed in a dark closet during an earthquake, you can use the cheat to fix them. Just Shift-Click them, jump into CAS, and give them a makeover that actually fits the vibe of Willow Creek. You don't even have to add them to your household. You just fix them and send them on their way. It’s like being a secret stylist for the entire digital world.

Actionable Steps for a Perfect Edit

If you want to ensure your game stays stable while using these powerful commands, follow this specific workflow:

1. Save Your Game First: Always. Before you enter CAS with full edit mode, hit "Save As" and create a new slot. If the UI freezes during the transition, you won't lose your progress.
2. Trigger in Live Mode: Don't wait until you're already in the editor. Enable testingcheats true and cas.fulleditmode while standing on your home lot.
3. Check Every Outfit: When you're editing a Sim's body or face, remember that those changes apply to all their outfits (Everyday, Formal, Athletic, etc.). However, sometimes the "Skin Details" like freckles or scars need to be manually re-applied to each category if you're adding them for the first time.
4. Verify Relationships: Before clicking the checkmark to finish, go to the relationship editor in the top left. Ensure your "Household Members" still have the correct labels (Husband, Wife, Roommate, Son).
5. Restart the Console: If you are playing on a lower-end PC or an older console, it's a good idea to restart the game after a massive CAS session where you've edited 5+ Sims. This clears the cache and prevents the dreaded "Error Code 122" or "Error Code 0" when trying to save later.

Using the cas cheat for sims 4 is basically a rite of passage. It turns the game from a rigid simulation into a true digital dollhouse where you have total control over the aesthetic and the narrative. Just remember to handle the occults with care and always keep a backup save handy.