4x4 Last 2 Edges (Edge Flip Alg)
This guide explains how to fix the edge flip that can occur during the last two edges (L2E) stage of a 4×4 solve. It’s written for beginners and focuses on setting up the cube correctly before performing the algorithm.
What Is the 4×4 Edge Flip?
The edge flip happens when your final two edge pairs are correctly paired, but one or both edges are flipped the wrong way. At this point, normal edge pairing moves will no longer work.
This situation is unique to big cubes and requires a specific edge flip algorithm to solve.
Note: For the edge flip algorithm to work, the matching edge pairs must be positioned opposite each other.
How to Perform the 4×4 Edge Flip Algorithm
- Inspect your last two edge pairs. There are three correct and three incorrect configurations.
- If the edges are incorrectly positioned, hold them in the LEFT and RIGHT slots on the top layer and perform: R' U F' U'
- Once positioned correctly, hold the cube so the two edge pairs are on the FRONT face in the LEFT and RIGHT slots.
- Perform a u' setup move.
- Execute the edge flip algorithm: R U R' F R' F' R
- Undo the setup move by performing u.
Once complete, your last two edges should be solved and you can continue finishing the cube.