Cookie Clicker is an incremental idle game with a focus on exponential growth. The core features of the game include:

Cookie Production: The primary goal is to produce cookies. This is done by:

Manually clicking a large cookie.

Purchasing buildings (cursors, grandmas, farms, etc.) that automatically generate cookies over time.

Unlocking upgrades to boost the efficiency of both clicks and buildings.

Golden Cookies and Wrinklers:

Golden Cookies: These appear randomly and, when clicked, grant temporary boosts to cookie production or other helpful effects.

Wrinklers: These are creatures that appear during a specific event, reducing your cookie production. However, popping them returns all the cookies they've digested with interest.

Ascension and Prestige: After reaching a certain number of cookies, you can "ascend." This resets your progress but grants you "prestige levels" and "heavenly chips," which provide a permanent boost to future playthroughs.

Mini-Games: Certain buildings unlock their own mini-games, such as:

The Garden: A farming mini-game where you can cross-breed plants to gain various effects.

The Stock Market: A mini-game that allows you to trade goods for cookies.

Achievements and Milk: The game has a large number of achievements. Unlocking them adds to a "milk" visual that appears in the game, which in turn provides a bonus to cookie production.