In-N-OutThree All Beef Patties & Three Slices of CheeseBeefCheeseSimply ask for a 3x3 (3 by 3) Burger made with all your favorite toppings.All Locations6 - High$4.45http://hackthemenu.com/in-n-out/secret-menu/3-x-3/Heard of the In-N-Out 3 x 3 Burger? Is In-N-Out Burger's Double Double not filling you up? Well, you are in luck. Hidden on In-N-Out Burger's "secret menu" is a burger called the 3 x 3. As you probably imagined, the secret menu's 3 x 3 made up of three 100% pure beef patties, hand-leafed lettuce, tomato, spread, three slices of American cheese, with or without onions, stacked high on a freshly baked bun. Mouth watering yet? Some people find the third patty to be overwhelming, but not us. Treat yourself to a 3 x 3 ... and a nice nap right after. In-N-Out Burger has one of the best secret menus out there, and the 3 x 3 is a prime example why. You are free to get any amount of burgers or slices of cheese that you want. Another staple on the In-N-Out secret menu is the 4 x 4 Burger . Be sure to check out the In-N-Out Secret Menu as well as visiting our home page to check out the complete list of All the Secret Menus from all your favorite restaurants!