All rules from 1910s still stand with the following changes:
- Heir: Women are allowed to be heirs (they are no longer forced to move out when they marry).
- Traits: Daughters no longer have to take Creative as their first trait.
- Home/Building
- All forms of lighting are allowed.
- Radios are allowed, but only Talk Radio.
- Movies are allowed (but not TV shows). Recommend that you use this sparingly as movie theaters would have existed in this decade, but televisions would not be in the home for many more years.
- Surrealism paintings are allowed.
- Wind turbines are allowed.
- Upright vacuum cleaners are available.
- Photo booths are allowed.
- Education
- If you have High School Years, you can go with your Sim to school and Prom is allowed.
- Career
- Male Sims are permitted the following careers: Business (Management), Criminal (Boss), Critic (either branch), Culinary (either branch), Doctor, Education (either branch), Engineer (Mechanical), Entertainer (Musician), Freelancer (Writer), Gardener (either branch), Interior Decorator, Law (either branch), Military (Officer), Painter (either branch), Politics (Politician), Writing (either branch). Sims may NOT join the Scientist career anymore.
- Female Sims are allowed to work if they are widowed, divorced, single, or if their husband does not bring in enough money. They are permitted the following careers: Criminal (Boss), Culinary (Chef), Entertainer (Musician), Freelancer (Writer), Gardener (either branch), Interior Decorator, Painter (either branch), Writing (either branch).
- Young Adults are encouraged to work in the Criminal (Boss) career.
- Part-time work: Men can be a fisherman, lifeguard, or manual laborer. Women can be a babysitter, lifeguard, manual laborer, or retail employee. Teens and Elderly cannot have part-time work.
- Holidays
- Add a new holiday: Armistice Day (Fall Monday): No Decorations, Day Off, Traditions – Remembrance, Tell Stories, Thankful Spirit
- Miscellaneous
- No alcohol of any kind is allowed! You cannot drink beer, nectar, etc.
- Events other than weddings and family reunions are allowed (except baby showers, play dates, and slumber parties).
- Women can vote on Neighborhood Action Plans.
- Rock climbing is allowed.
- Manicures, pedicures, and face masks are allowed.
- Women shaving their legs is now appropriate.