A free demo for The Sims 3 is no longer available. When the game was first released in 2011, an in-browser demo was available but has since been removed.
Upon its original release, The Sims 3 offered twenty minutes worth of free in-browser game play on its website. In the demo, three character types were offered. These characters underwent adventures available through some of The Sims 3 expansion packs including The Sims 3 Late Night and The Sims 3 World Adventures.
The Sims 3 is purchased to play through Origin. The starter pack is available for $19.99. It includes the Late Night expansion pack. The Sims 3 features many other expansion packs that are all available for purchase.