rubik slotCheck Rubikslot's bookcaseRubik slot. Find all flipbooks of Rubikslot. Like Rubikslot's bookcase? Contact Rubikslot on AnyFlip.The idea is to solve the remainder of the first two layers except for one slot, the keyhole. There are 4 Slots, each consisting of a corner on the bottom (D) layer and an edge on the middle