The Compact Machine Wall is a block added by Compact Machines, and it is the basic structural block used in the creation of the various sizes of room blocks. The Solid Compact Machine Wall is found in the room accessed by entering a Compact Machine, and has the same appearance, but serves as a barrier and possible interaction point between the Compact Machine and the blocks adjacent to the corresponding device outside, as well as an exit point while holding the Personal Shrinking Device.