Do You Need Other Sims Games to Play The Sims 3 on PC?

No. The Sims 3 is a standalone game.

Additional Content (Optional)

• Expansion/Stuff Packs: Add worlds, careers, skills, objects—sold separately.
• Complete Collections: "Legacy Edition" or "Complete Collection" bundles base game + all packs.

Base game alone provides full core experience; expansions enhance it per your preference and budget.