Cookie Clicker! Just click the cookie (for 2 cookies) or buy an upgrade! (such as clicker) Upgrades make your clicks (on the cookie) give you more cookies.
Prices of things: Autoclicker: 15 cookies (By the way, if you get tons of cookies and spam-buy the autoclicker it is very OP, (hundreds of cookies at once) but it might get fixed lol)
