Rubik's Cube & puzzles
What is F2L? Solving the first two layers in pairs
F2L means First Two Layers. Learn how pairing a corner with its edge works, with three verified starter cases, the algorithms that solve them, and how to practise on a virtual cube.
F2L stands for First Two Layers. It is the second stage of the CFOP method and the biggest time-saver in cubing. Instead of solving the white corners and then the middle-layer edges separately, F2L solves each white corner together with the edge that belongs beside it, as a pair, and puts both into the cube in one go.
The idea of a pair
In the beginner method you place a corner with R U R' U', then place a middle edge with a longer algorithm. In F2L you first look for a corner and its matching edge. If you can bring them next to each other with the right colours lined up, they behave as a single piece, and a short sequence of moves drops both into their slot.
The pair belongs in the slot at the bottom front right. That slot contains the corner DFR (bottom, front, right) and the edge FR (front, right).
Three starter cases
On a cube held with yellow on top and green in front, the slot at the bottom front right holds the corner DFR and the edge FR. Three cases come up again and again, and each has been checked by simulation: from the starting position, the algorithm puts both pieces into the slot and leaves the cube solved.
- The white sticker faces the front, with the corner and edge joined in the top layer:
U R U' R', or the sledgehammerR' F R F'. - The white sticker faces up, with the edge beside it:
R U2 R' U' R U R'. - The corner is in the slot but twisted, with its white sticker facing right and the edge above it:
R U R' U' R U R'.
The F2L practice page shows each starting position on a cube that plays the moves, one at a time. Mirror the algorithms for the left-hand slot: swap R and L and turn every move the other way.
How to learn F2L
- Start with the first layer cross, then solve all four corners with the beginner method until it is automatic.
- Learn the three cases above for the front-right slot. To set one up on the virtual cube, type the algorithm backwards: each move turned the other way, in reverse order.
- Mirror them for the front-left slot, the back-right and the back-left. Mirroring means swapping R and L and turning every move the other way.
- Practise one slot at a time. Solve the cross, then do only the first F2L pair, and repeat.
- Solve it intuitively. Most pairs can be solved without learning every case: ask what moves bring the corner and edge together, how to line them up, and what drops them in.
- Learn the rest by playing. The full set has 41 cases, and many are just variations of these three.
Why F2L is faster
The beginner method treats the corners and the middle-layer edges as separate jobs, so it needs more moves. F2L does both jobs together, so an experienced solver finishes the first two layers in far fewer moves. Each pair is a small puzzle, and good solvers plan the next pair while inserting the current one.
Common questions
What does F2L stand for?
First Two Layers: the white layer (corners and cross) and the middle layer.
Is F2L hard?
It is harder than the beginner method because you have to think instead of repeating an algorithm. It is easier than it looks when you start with one slot and a few cases.
How many F2L cases are there?
41 basic cases for a pair in one slot. Most can be solved by working out the moves, so you do not need to memorise all of them.
What should I learn first?
Be comfortable with the seven-step method and the sexy move trigger. The triggers R U R' U' and R' F R F' appear inside many F2L cases.
This guide is general information. For exams, follow your school, teacher and official exam board, and use your own judgement about what suits your child.