Build & Create-a-Sim
Genetics Roulette
You don't get to design these kids.
โฆ Set your packs to confirm this works for you
Type
Create-a-Sim ยท Legacy
Difficulty
Moderate
Length
Multi-generation
Best for
Players who love unpredictable genetics
Difficulty (1โ5 plumbobs): 1 Casual ยท 2 Moderate ยท 3 Hard ยท 4 Brutal ยท 5 Extreme
๐ The story
You don't get to design these kids. Two completely randomised strangers fall in love, and whatever the genetic dice throw together โ the nose, the temper, the unfortunate hair โ that's your household now. No take-backs.
๐ The goal
Fully **randomise two founders** in CAS, pair them, and play their genetically-inherited children with no cosmetic edits.
๐ Packs required
โ Base game only
Packs recommended
None
๐ก Setup
LotAny family home
FundsDefault
AgingOn, normal
SimsTwo fully randomised founders
๐ Getting started
- In CAS, use the randomise button on two Sims until they're completely random, then move them in together.
- Randomise both founders fully in CAS; make no manual edits.
โจ๏ธ Cheats to type
testingcheats true๐ General rules
- Founders are 100% randomised โ no tweaking their looks or traits.
- Children are played exactly as their genetics produce them.
- No editing a child's appearance in CAS, ever.
โจ Specific rules
- Pair the two founders and have children.
- Accept whatever the kids inherit โ looks and (where applicable) traits.
- Continue the bloodline, embracing the genetic chaos.
โ What you can do
- Use CAS randomise on both founders; play whatever children the genetics produce.
- Use `bb.moveobjects`.
โ What you can't do
- No cosmetic edits to the founders or children after randomising.
- Play the genetics you're dealt.
๐ฏ Objectives โ complete the checklist
0 of 5 done ยท 0%
๐ฎ If you don't own the packs
Fully base-game.
๐ก Strategy tips
- Resist the urge to "fix" an unfortunate child โ the unpredictability *is* the challenge.
- Let inherited features inspire each Sim's story and style choices (you can dress them, just not re-sculpt them).
- Pair children with other random Sims to keep the gene pool wild.
๐ Milestones โ track your progress
0 of 5 done ยท 0%
๐ฅ Want it harder?
- Randomise every spouse who marries in, too โ no hand-picked partners ever.
- Run it as a full ten-generation legacy of pure randomness.
๐ญ Variations
A "roll for everything" version where traits, aspirations and careers are also randomised each generation. ---
A popular community CAS-genetics format. ยท Last tested: Patch 1.108 โ Feb 2026