Best CAS Challenges for The Sims 4: 70+ Ideas and Inspirations
CAS in The Sims 4 is an endless playground for creativity, but even the most inspired simmers can run out of ideas sometimes. That’s where challenges come in – small, ready-made prompts with rules that bring back the excitement and turn making sims into a real adventure.
In our collection, you’ll find challenges for every taste and skill level. If you don’t feel like spending hours picking and choosing, we start off with ready-to-go 15- to 100-day formats – just grab one and follow along! After that, there are quick ideas for inspiration (like making a sim based on a song or movie) as well as real endurance tests (think: making a sim upside down or with inverted colors). We tried to gather the most complete and fun collection out there, so everyone can find something that sparks their interest.
100 Days Challenges
If you get lost in the endless sea of challenges, ready-made 100-day formats are your lifesaver! Just pick one and dive into a creative marathon where each day is already planned out for you.
This is a classic: every day comes with a set theme or look for creating a sim. No stress over what to do next: you just open the list and get designing! It ranges from simple prompts like “sim in blue” to more complex, concept-heavy ideas.
2. 100 Day Creativity Challenge by IllusoryThrall
Now, this one’s for those who love a real challenge! The creator made a challenge that builds both your CAS and building skills. The idea is simple: for each prompt, you make a household and a related building (a house, a lot, or at least a themed room). The author really put their heart into this, making sure every day is unique and interesting for all players.
3. 50 Days of Sims Style
A massive 50-day challenge by nikatyler, packed with a huge variety of aesthetics and styles – from basic looks to niche directions like Cottagecore, Dark Academia, or Y2K. It’s full creative freedom: go through all 50 days in a row, pick only your favorites, point with your eyes closed and pick randomly, or even use it as a bingo board. This challenge covers pretty much every major aesthetic and subculture out there!
4. Every Townie is a Different Occult Challenge
Take game-generated NPCs and transform each one into a different supernatural being. Spin a wheel to decide each townie’s type: vampire, mermaid, ghost, fairy, and more.
5. Hobbies Challenge
Looks inspired by artists, chefs, geeks, and all sorts of hobbies.
6. Art Movements Challenge
Outfits and concepts built around movements like cubism, pop art, or surrealism.
7. TV Genres Challenge
Create a sim styled as a character from a drama, sitcom, or any other TV genre.
8. Cyber Angel Challenge
A mashup of futuristic tech and celestial/heavenly themes.
9. Teen-A-Day
A chill 28-day challenge focused on making teen sims. The creator gives you total freedom: do just one day or all 28, stick to stereotypes or flip them on their head, share your results or keep them to yourself. There are no strict rules – just have fun making teens and enjoy the process!
10. 10 Minute CAS Challenge
A rapid-fire challenge where you’ve got just 10 minutes to make a fully fleshed-out sim. The time limit nudges you not to overthink details and forces quick decisions. People love comparing how their female and male sims turn out – usually, making guys in a rush feels way harder!
11. Wheel Spin Challenge
A popular challenge where every part of your sim’s look gets decided by spinning a random wheel: from skin tone to accessories. It’s pure lottery: sometimes you’ll get a harmoniously put-together sim, other times total chaos! You can watch an example video in the link, and in the post you’ll find links to all the wheels needed to try this yourself.
12. TikTok Trend Challenge
Recreate a look from the latest TikTok trends.
13. Sporty Challenge
Go for a stylish, athletic vibe.
14. High Fashion Challenge
Think couture, unique runway looks, and avant-garde style.
15. No Symmetry Challenge
Try to add as much asymmetry as possible to your sim’s face and body.
16. Inverted Challenge in The Sims 4
A quirky challenge where you create a sim with an inverted filter on: every color is flipped to its opposite. The goal is to make a character that actually looks good in normal colors, all while working blind with a totally reversed palette. The easiest way to invert colors is to use the built-in features of your operating system – they’re instant and super easy to switch back and forth.For Windows 10/11: Start → Settings → Accessibility → Color Filters → Inverted
17. Random Colour Palette Challenge
A creative challenge where your sim’s whole look is based on a randomly generated color palette. You try to match hair, makeup, clothing, and accessories to the palette as closely as possible—which can result in anything from total harmony to wild chaos. You can generate a palette at the linked website, and check out a gameplay example in the video.
18. Moodboard Challenge
Create a sim inspired by a themed moodboard.
19. Royal Challenge
Go full aristocracy: think luxury, elegance, and regal vibes.
20. Modern Witch Challenge
A modern witch: a blend of goth and boho styles.
21. Fashion Decades Challenge
Design sims inspired by the 20s, 50s, 80s, and so on.
22. Reverse CAS Challenge
A unique challenge where you create a sim backwards, starting with the very last step you normally take and working your way to the beginning. For example, you’d choose hats and accessories first, then clothes, then makeup, and only at the end pick facial features and hairstyle. Bonus rules make it trickier: pick items from the bottom of the list and don’t double back to previous categories!
23. All Random Challenge
Hit random on every part of the sim’s look and don’t change a thing.
24. Historical Figure Challenge
Try to recreate a well-known figure from history.
25. No Outfits Repeat Challenge
Make 5–7 outfits, not repeating any items between looks.
26. Making Identical Triplets as Different as Possible
In this challenge, you take three totally identical sims (triplets) and make them as different as possible from each other, while keeping their facial features the same. Switch things up with different hairstyles, makeup, clothing styles, and overall aesthetics. It’s a great way to show how much appearance can change our perception of a character. Check out the sample sims in the linked videos (here and here).
27. No Makeup Challenge
A totally natural look – no makeup allowed.
28. K-Pop Idol Challenge
Go bold and unique with a bright, personalized style and carefully chosen makeup.
29. Medieval Challenge
Channel Scandinavian or classic medieval vibes.
30. Pinterest Picks My Sim Challenge
A fun one where every part of your sim’s appearance is decided by the first picture that pops up on Pinterest. Search “skin” for a skin tone, “face” for facial features, “hair” for hairstyle, and so on. The result entirely depends on the Pinterest algorithm: so you might end up with some wild combinations, especially if your feed isn’t tailored for Sims!
31. Birthday CAS Challenge
A personal challenge by DazzlingSimmer where your sim’s look is built around your birth date. Year picks the sim’s gender (before 2000 – male, after – female), month gives the main color for clothes and accessories, and the day sets the overall theme – anything from diva to boho style. It’s a fun way to make a unique sim that's tied to you!
32. Pixelated Challenge
A challenge using the “Pixelate” ReShade filter, which turns The Sims 4 into a pixel game, Stardew Valley style. You have to make a sim while everything’s super pixelated, then turn the filter off to see how it turned out. In ReShade, look up “drunk” or “pixelate” – you can adjust pixel size and sharpness to get just the right level of chaos.
33. Black & White Challenge
Make a sim with your monitor set to black-and-white (Start → Settings → Accessibility → Color Filters → turn on “Grayscale”). With all colors gone, you’re left guessing hair, eye, and makeup colors based only on shades of gray. Turning the filter off at the end is a total surprise – sometimes it’s a disaster, sometimes a masterpiece.
34. Letting a Random Generator make my Sim
Let an online generator pick every trait and feature for your sim. Just follow the random prompts and you’ll end up with a totally unique character.
35. Make No Mistakes Challenge
Strict rules: whatever you pick, you have to stick with. If you click an appearance item or outfit, there’s no going back. No do-overs or tweaking – tests your focus and forces quick, confident decisions.
36. Letting THE SIMS 4 Decide My Sim
The rarely-used “Story Mode” feature creates a sim for you. Answer questions about personality and habits, and the game will auto-generate a fitting sim. Most players skip this option, which makes it perfect for a challenge.
37. Song Lyrics Challenge
Take inspiration from your favorite song lyrics when creating a sim: from straightforward lines like “girls with tattoos who like getting in trouble” to cryptic metaphors.
38. Going to the Met Gala
A luxurious, red-carpet look for the most stylish event of the year.
39. Based on The Sims Influencer
Recreate the style of a popular Sims streamer or YouTuber.
40. CAS Using Only Items You Hate
Only use those clothes and hairstyles you usually avoid or can’t stand.
41. Random Genetics Challenge With FAIRIES
The classic random genetics challenge, but with a twist – use only one expansion or stuff pack. Make two totally randomized sims (fairies, vampires, mermaids, etc. depending on the pack), then have a child and try to improve their appearance. You can roll a die to pick a pack or use them all at once for some real chaos!
42. Going to Pride Festival
A bright, rainbow-inspired look to celebrate diversity and love.
43. Only Items You Never Used
Dig into those forgotten wardrobe sections and use items you’ve never tried before.
44. Random New Country
Spin the globe and create a sim in the traditional style of whatever country you land on. For an extra twist, try making your sim based purely on your own ideas of the country’s traditional look – then Google it afterward to see how close you got.
45. 10 minute Ugly to Beauty Challenge
A popular makeover where you take the most awkward sim from the gallery and turn them into a stunner – all on a tight timer. The main rule: no presets allowed; every change has to be done using the sliders. Try the 5-minute version for even more pressure, where you have to make snap decisions and can’t sweat the details.
46. Post-Apocalyptic Sim
Create a survivor in a ruined world: worn clothes, scars, and a hardened look.
47. Makeover Your Old Sim
Breathe new life into your old character with modern trends. A great idea is to give your legacy founder a complete makeover.
48. Barbie/Doll Sim
Create a sim with unrealistically perfect proportions and a true doll-like appearance.
49. Movie/Book Character
Bring your favorite character from literature or the big screen to life.
50. Townies Recreation
From memory, try to recreate the look of any NPC from the game.
51. Base Game Only Sim
A true survival test: no expansions or mods, just base game content.
52. 8 Occults, 1 Base
One sim gets turned into eight different occult creatures: vampire, mermaid, werewolf, spellcaster, and more. The main facial features stay the same—only hair, eyes, skin tone, and little details change.
53. Pack-Specific/CC-Specific Sim
Limit yourself to items from just one pack or only use custom content.54. Elder-A-Day
A short 15-day challenge from Plumdot where you make elders around different themes – anything from tropical cruise to cat lover. Interpret the themes however you want, give your sims a backstory, and snap some creative photos. The main goal: show that elders can be just as cool and interesting as anyone else!
55. Holiday Sims
The theme looks for whatever season or holiday it is – from Halloween to Chinese New Year.
56. Ethnicity/Country-Based Sim
Dive into traditional clothing and cultural features from around the world.
57. Distorted Challenge
When regular challenges feel too easy, try making a sim with the “Drunk” filter turned on in ReShade. The whole screen turns into a wavy mess – just clicking the right button is a quest. It’s not just the sim that gets warped: menus and the interface do too, making the whole process nearly impossible.
58. Shape-Based Sim
Get creative: what would a star-shaped person or a triangle character look like?
59. Greek God/Goddess Sim
Bring the power and beauty of ancient gods into the modern world.
60. Ugly to Beauty Challenge
Start with the most “awkward” sim possible, then transform them into a total stunner.
61. Each Sim is a Different School Subject by Elliandra
A creative challenge where each sim represents a different school subject. Elliandra made a wheel with all sorts of classes and spins it to pick the theme: math, PE, you name it. It’s especially fun during the back-to-school season, and you can make anything from a few sims to a whole team of teacher characters!
62. Pinterest Inspiration Challenge
Find a custom look on Pinterest that you love and recreate it in CAS.
63. Black & White Challenge
Only use black and white elements for the whole sim.
64. No CC Challenge
A challenge with zero custom content – base game and official packs only.
65. Villain Makeover Challenge
Turn a cute sim into a villain through style and facial expressions.
66. Upside Down Challenge
A legendary, but insanely tricky challenge where you make a sim with your screen flipped upside down. In Windows display settings: Start → Settings → System → Display → Screen Orientation → pick "Landscape (flipped)." Your mouse moves the opposite way – pull down to go up! Even clicking a button becomes a mind-bender as you try to adapt to reversed controls.
67. Opposites Challenge
Make two sims in the same household with totally opposite styles.
68. Speed CAS Challenge
You’ve got 5 minutes to whip up a great sim – go!
69.Decades Challenge
Pick an era and create a sim who totally embodies that time.
70. Genderbend Challenge
Swap the gender of a well-known character and redo their style.
71. Infant to Adult Challenge
Start with a baby sim and age them up step-by-step to an adult, watching how their features change along the way. With infants having limited options (no makeup, little clothing), you get to see the natural transformation all through the sim’s life stages.
