In-N-Out4 All Beef Patties & 4 Slices of CheeseBeefCheeseSimply ask for a 3x3 (3 by 3) Burger made with all your favorite toppings.All Locations5 - Medium-High$5.50http://hackthemenu.com/in-n-out/secret-menu/4-x-4/Is the In-N-Out Burger's Double Double not filling you up? Tried the 3 x 3 Burger and it wasn't enough either? Well, you are in luck. Hidden on In-N-Out Burger's "secret menu" is a burger called the 4 x 4. That's right an In-N-Out 4x4 includes 4 burgers & 4 slices of cheese! Like you probably guessed this is how it all stacks up - the secret menu's 4 x 4 made up of four 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. As you can see by the picture, the In-N-Out 4x4 is a whole lot meat. We suggest this secret menu item only for the biggest eaters as most people won't be able to finish this burger, let alone open their mouth wide enough to take a bite. but, we won't blame you for trying though! Thanks In-N-Out. 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!