4x4 Reduction

On a 3×3, the centers are bolted to the core and tell you what color each face will be. Not here. The Master has 24 center pieces, four per face, and every one of them can travel. The lit 2×2 blocks are the centers - drag any layer and watch them scatter.

That is the first job of this method: gather the 24 loose center tiles back into six solid blocks, so the cube has centers like a 3×3 again.

The lit pieces are edges: 24 of them, twice as many as a 3×3. They live in pairs - two slim pieces sitting side by side that together act like one 3×3 edge. A scramble splits the pairs apart, and job number two is to reunite all twelve.

The 8 corners are exactly the same as on a 3×3. Once centers are grouped and edges are paired, the whole puzzle plays by 3×3 rules. That is why this method is called reduction: you reduce the big cube to a small one, then solve the small one.

With no fixed centers, the cube cannot remind you which color belongs where - you have to know the layout. Opposites first: white sits opposite yellow, red opposite orange, and blue opposite green.

Direction matters too: hold white on top with green facing you, and red must be on your right. Build the centers in a mirrored layout and the corners will refuse to solve later - the printed guide warns about exactly this trap.

The outside faces read exactly like 3×3 notation: a capital letter is a quarter turn of that face, clockwise as you look at it. An apostrophe like U′ means counterclockwise, a U2 means twice around.

New on the Master: each face hides an inside slice right behind it, and it gets the same letter in lowercase. So r turns the slice just inside the right face, while the right face itself stays put.

Tap a card and watch closely: only the thin inner layer moves. These slices are what split centers and edge pairs apart - and what put them back together.

When a face letter and its slice letter are written together, like Rr or Dd, grab both layers and turn them as one thick block. The prime version marks both letters: R′r′.

That is the whole vocabulary. Watch it in motion, then we start solving.

Hold the cube with a white center tile on the up face - on a real Rubik's Master, the one with the logo. From here on everything that is not a center is dimmed, exactly like the gray tiles in the printed guide.

The white tiles are glowing. Three already sit on top; the fourth is loose on the front face. The whole centers stage is this one situation, met over and over: a tile that belongs up top, waiting somewhere else.

First, set up: turn the front face until the loose white tile sits in the lower right of its center block, and turn the top until a non-white tile waits in the upper left up there. Then run the three moves.

If the missing white tile is on the down face instead, turn the bottom until it sits in the lower right of its block, then use the half-turn version: the tile rides the elevator all the way from floor to ceiling.

Repeat the same routine for the other colors, in this order: white, yellow, red, green, orange, blue. Yellow goes to the bottom, since it is white's opposite.

From red onward, placement matters, not just grouping. Keep the layout rule in mind: with yellow up, green sits to the right of red. Check twice, build once - a mirrored layout only reveals itself much later, at the corners.

Three drills, one white tile from a finished block each time. Set up the front and the top, then ride the elevator.

Pick any pair - here, the two white and orange pieces, glowing. Right now they sit apart. Paired up, they will sit side by side in one slot, colors matching, and from then on they move through every algorithm as a single piece.

The edges do not need to match the centers yet. Ignore colors under your pieces entirely - this stage only cares that twins end up together.

Using only outside turns - they can never break a center block or an already-finished pair - steer the two pieces onto the left and right edges of the front face.

Now read the two front tiles. On this cube both pieces sit level and show the same color toward you: they are directly across from each other, ready to pair. If instead one sits high and one sits low, they need one lining-up sequence first - next step covers it.

Here the two glowing pieces sit at different heights - not across from each other. Four moves fix that. Afterward the cube looks exactly like the previous step, and the pairing sequence can take over.

With the pieces across from each other, seven moves join them. The printed guide teaches it as a phrase - Ddon't Run F'ast Unless R'unning Fast D'd'aily - each word carrying its move.

Repeat the routine - find the twins, bring them to the front, line up if needed, pair - until all 24 pieces sit in matched pairs. The cube on screen is there: still scrambled, but every edge slot shows a single color pair, and the centers survived it all.

Two situations, the same finish. The goal checker watches all twelve pairs, so nothing gets past it.

This cube looks scrambled, but look closer: every center block is solid and every edge pair is together. It is a 3×3 wearing a bigger suit. From here, follow the Beginner's Method start to finish: white cross, white corners, middle layer, and the yellow endgame.

One rule keeps the reduction alive: turn only the outside faces. Outer turns can never split a pair or a center. Touch an inner slice and your careful work unravels. Try a few turns - the cube is yours.

Every 3×3 algorithm works untouched. Here is the familiar middle-layer insert running on the Master - the glowing edge pair rides through all eight moves as a single piece.

When you reach the yellow cross, count the yellow edge pairs showing on top. Zero, two or four: perfectly normal, carry on with the 3×3 method. One or three - like the cube on screen - is parity: one edge pair is flipped in place, something a real 3×3 cannot do.

Hold the cube so the flipped pair - the gap in your cross - faces the front, then move to the fix.

Fifteen moves - the longest algorithm in this guide, and the only place lowercase and capital letters mix. Read each card carefully: r2 is the inner slice, B2 the outer face. Step through slowly the first few times.

Both parity counts, ending in a full yellow cross. The second drill chains the fix into the normal cross algorithm, just like a real solve.

The very last stage: the top is all yellow, corners are seated, and only the edge pairs need positioning. Count how many already match their side centers. Zero or one: the normal 3×3 cycle handles it. Exactly two placed pairs is the second parity - a swap no 3×3 algorithm can produce.

The hold depends on the shape. Placed pairs opposite each other: put them on the left and right. Placed pairs next to each other: put them on the left and back.

Six moves, remembered as three little questions: Are you? Are you you? Are you? Each are is r2, and each you is a top layer - face, both, then inside.

With the placed pairs held left and right, this swaps the two stragglers directly - here it finishes the cube on the spot.

When the placed pairs sit next to each other, hold them on the left and back, run the same six moves, and finish with the ordinary 3×3 edge cycle. Nothing new to memorize - just the questions, a re-grip, and a cycle you already know.

Two boards, each one algorithm from done. The last moves you make in this guide.

The whole method, end to end: group the centers, pair the edges, then let your 3×3 instincts drive - with two parity fixes in your back pocket for when the big cube bends the rules.

Scramble it and run the journey for real. Inner slices will tear the centers and pairs apart - rebuilding them is the whole game.

And if the 3×3 stage felt shaky anywhere, the Beginner's Method guide is right there to replay.