The main area is a platform of boxes. At the back, there is a large portal used to enter or exit the zone. To the left of the portal is a staircase connecting to one of the large floating boxes. South of the portal is a staircase made of boxes, which leads to the lower part of the platform, containing a table and chairs made of boxes, as well as a pile of boxes. In the distance northeast of the portal there is a buoy, made of cardboard, numbered 3.
On the left floating box, near the portal, is a pile of boxes and a zipline. This zipline connects to a floating box in the southeast with a trampoline on top of it. This trampoline bounces players to another box to the north, which has treasure chests with coins and a cannon that can be used to launch back onto the main platform.
The number of question marks correspond to the number of letters in "Box Dimension".
Gary the Gadget Guy originally planned on naming the zone "The Corrugated Fiberboard Dimensional Space". When Gary asked Rookie what he would name it, he suggested "The Box Dimension" instead, and Gary said it was the perfect name.
Rookie believed he had seen the dimension before in his dreams. However, Aunt Arctic told him it was all in his imagination.
The new dimension helps to prove Gary's "Multiverse theory".