A classic incremental game created by French programmer Julien "Orteil" Thiennot. Play it here.

In Cookie Clicker, you start by clicking on a large cookie to earn one cookie per click. As you accumulate cookies, you can purchase various assets like cursors, grandmas, and farms that automatically generate cookies for you. The game features upgrades and mechanics that allow you to earn cookies in different ways, such as golden cookies that appear randomly and offer temporary boosts. The game also includes a "prestige" system where you can reset your progress to earn heavenly chips and prestige levels, which provide permanent boosts in future play-throughs. Released on August 8, 2013, the game has been regularly updated and has a dedicated fanbase. It's widely described as addictive and has played a significant role in the emergence of idle gaming.