Why? I want to get into Level -18 through Level 11, and from there I can go through the windows to get to either 6.1 or 36. If I go into 36, I go through a gate back to 4, find the vending machine back to 6.1, and boom. And there's always the option of exiting back to Level 11. You'll probably see me on either Level 4, 6.1, 11, 36 or -18.
Pizza Zone, a new restaurant I found in 6.1. If you want to, you can also come along to Camp Burrito, a small outpost I made in the Hungry Amigos restaurant.