The secret name in Cookie Clicker is "saysopensesame". To use it, you need to click on your bakerys name to open up the text box so you can modify it. In the pop-up box, you can use the default random name or make up your own. All you have to do is make a single space after your name, and then type in the words "saysopensesame" all as one word. Then hit enter. Next, in the top left corner of your bakery, youll see a small dev box icon appear. You can now click on that to open up plenty of dev tools that will always be at your disposal. It is important to note that using this cheat will secretly award the player the "Cheated cookies taste awful" shadow achievement.