rubik slotHow I do F2L Cases (Back Slot Regrips). 216K views · 5 years Rubik's Cube: F2L Keyhole Technique & Pseudoslotting (Beginner to Advanced).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