This is The Sims 3: 70s, 80s, & 90s Stuff, a Stuff Pack addon released in 2013 requiring the base game. Gameplay is enhanced by adding extensive cosmetic content: you customize your Sims with era-specific outfits, hairstyles, and facial hair from the 70s disco, 80s glam, and 90s grunge scenes. The core loop remains simulation, but you gain new décor items like arcade games and disco balls to redecorate homes, offering deep personalization without introducing new mechanics or storylines.