rubik slotThe 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 middleThe 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