Pair all twelve two-piece edges — 4×4 Reduction

Before you start

All six centers are solved and in the correct order.

How to hold your cube

Use front-left (FL) and front-right (FR) as the working edge positions.

1. Find both wings of one edge

For example, both white-blue wings belong together. Matching only white is insufficient: the second color must also agree.

Use outer turns to bring the selected wings to the FL and FR edge positions. These are the vertical edges beside the front center. Outer turns move groups between slots without splitting their wings or mixing center colors.

2. Place the wings in opposite horizontal slices

Choose the upper wing at FL and the lower wing at FR (or the mirrored arrangement). Arrange their front-facing stickers to be the same color. A wide U turn can carry an upper wing across while leaving a lower wing still, forming a pair.

Before slicing, trace which wing Uw or Uw′ will move into FR. Choose the direction that brings the intended wing there; do not guess from one sticker alone.

3. Join, store, and restore

Use the chosen wide U turn to join the matching wings at FR. The centers may look mixed temporarily.
Lift the completed FR group out of the working slice with R U R' or R U' R'. Choose U’s direction so an unpaired top group replaces it at FR.
Reverse the exact wide turn from step 1. This restores the centers while the completed pair stays stored outside that slice.

Repeat. Use outer turns to move completed groups to U or D and to bring unpaired groups into the working positions. If the replacement group is already paired, choose another one; otherwise you may split your finished work.

4. Reorient a working group when needed

R U R' F R' F' R

This turns the FR group over as a unit. It changes which wing is upper and how its two colors face. It preserves center colors. Use it to arrange the working wings before slicing, not as a repair for a flipped last-layer edge.

5. Finish the last two pairs

Place the two remaining unpaired groups at FL and FR. Put the matching-color wings in the same horizontal slice; use the FR flip above if they are in opposite slices. Now slice the selected wing from FL toward FR, perform the FR flip, and undo the slice.

For the prepared upper-slice case below, that is Uw, then R U R' F R' F' R, then Uw'. The flip changes which wing returns, allowing both pairs to form. Match your setup to both visible colors in the example before using that exact version.

If either pair is still mixed, inspect the other color and adjust the working group’s orientation before retrying. Finish with twelve full pairs and six solid centers. Pairs do not need to be in their final solved locations yet.

Watch, then try

Work through an example

Use one move at a time first. This prepared case teaches a specific action; use the lesson’s setup instructions to recognize when it applies to your own scramble.

Watch one worked example

This is the final-two-pairs case: follow Uw, the seven-move FR flip, and Uw′. The initial and final nets show both colors of each wing. The return slice restores centers while exchanging the selected wings.

Example grip: yellow up · blue front · red right at the start. Follow any written whole-cube rotations.

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Loading 3D cube…

Drag to inspect other faces. Arrow keys rotate the view when the cube is focused.

Copy this exact example on your own cube

Start with a solved 4×4, yellow up and blue front. Apply the setup below from left to right. This creates the example’s starting position. Keep this separate from the ongoing scramble you are solving through the course.

Uw R' F R F' R U' R' Uw'

Then follow the lesson sequence. If your cube’s color scheme differs, match the piece relationships using your own colors.

Compare the starting position and the result

Before the example

After the full sequence

Drag each cube to inspect its other faces.

Explain it to yourself

Check your understanding

Now use your own cube

Your turn

Find two wings with the same two colors. Join them, move the completed group out of the working slice, and restore the slice. Count complete groups on both faces.

Open a 4×4 Digital Cube for practice

Opens in a new tab so you can keep this lesson beside your practice. Check the lesson goal yourself; the Digital Cube does not grade it.

If you get stuck

A completed edge splits when I restore the slice.

Store it outside the active horizontal slice first and bring an unpaired group into its place.

The final two pairs are still mismatched.

Check matching wings occupy the same horizontal slice before slice–flip–slice-back, and compare both outward colors with the example.

Before moving on

Check your result

Your cube at this stage

All twelve edges paired

Both wings of every edge match on both faces, and the centers are restored. The groups are ready to solve like a 3×3.

Confirm these on your cube. Watching the animation alone does not complete the lesson.

All twelve edges contain two wings matching on both faces.All six centers are restored after pairing.I can distinguish a complete but reversed pair from two unmatched wings.

Check every item when you can do it yourself.