# Rubik 39;s Cube Solver 21 Moves Apk

## How to Solve a Rubik's Cube: Tips and Tricks for Beginners and Beyond

Solving the Rubik's Cube can be a fun and rewarding challenge, but it can also be frustrating if you don't know how to do it. There are many methods and algorithms that can help you solve the cube, but they require some practice and memorization. In this article, I will give you some tips and tricks that can help you solve the Rubik's Cube faster and easier.

## rubik 39;s cube solver 21 moves apk

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## Basic terminology and notation

Before we start solving the cube, we need to understand some basic terms and symbols that are used to describe the cube and its movements. Here are some of them:

Face: A face is one of the six sides of the cube, each with a different color. The faces are usually denoted by their initial letters: F (front), B (back), U (up), D (down), L (left), R (right).

Layer: A layer is a group of nine pieces that belong to one face. For example, the top layer consists of all the pieces on the U face.

Piece: A piece is one of the 26 smaller cubes that make up the Rubik's Cube. There are three types of pieces: centers, edges, and corners.

Center: A center is a piece that has only one sticker on it. There are six centers on the cube, one for each color. The centers never move relative to each other, so they determine the color scheme of the cube.

Edge: An edge is a piece that has two stickers on it. There are 12 edges on the cube, each with two different colors. The edges can move around the cube, but they always stay on their own layer.

Corner: A corner is a piece that has three stickers on it. There are eight corners on the cube, each with three different colors. The corners can move around the cube, but they always stay on their own corner.

Move: A move is an action that rotates one layer of the cube by 90 degrees or 180 degrees.. A move is an action that rotates one layer of the cube by 90 degrees or 180 degrees. For example, F means to turn the front face clockwise by 90 degrees, F' means to turn it counterclockwise by 90 degrees, and F2 means to turn it by 180 degrees. There are six basic moves for each face: F, B, U, D, L, R. You can also use lowercase letters to denote wide moves that turn two layers at once, such as f, b, u, d, l, r. Alternatively, you can use the letter w to indicate a wide move, such as Fw, Bw, Uw, Dw, Lw, Rw. There are also three cube rotations that change the orientation of the whole cube: x, y, z. These rotations follow the direction of the R, U, and F moves respectively. For example, x means to rotate the cube so that the right face becomes the front face. You can also use M, E, and S to denote slice moves that turn only the middle layer of the cube. These moves follow the direction of the L, D, and F moves respectively. For example, M means to turn the middle layer between L and R as if you were doing an L' move.

Here is a table that summarizes the basic notation for the Rubik's Cube:

Move

Description

F

Turn the front face clockwise by 90 degrees

F'

Turn the front face counterclockwise by 90 degrees

F2

Turn the front face by 180 degrees

B

Turn the back face clockwise by 90 degrees

B'

Turn the back face counterclockwise by 90 degrees

B2

Turn the back face by 180 degrees

U

Turn the up face clockwise by 90 degrees

U'

Turn the up face counterclockwise by 90 degrees

U2

Turn the up face by 180 degrees

D

Turn the down face clockwise by 90 degrees

D'

Turn the down face counterclockwise by 90 degrees

D2

Turn the down face by 180 degrees

L

Turn the left face clockwise by 90 degrees

L'

Turn the left face counterclockwise by 90 degrees

L2

Turn the left face by 180 degrees

R

Turn the right face clockwise by 90 degrees

R'

Turn the right face counterclockwise by 90 degrees

R2

Turn the right face by 180 degrees

x

Rotate the whole cube so that the right face becomes the front face

y

Rotate the whole cube so that the up face becomes the front face

z

Rotate the whole cube so that the front face becomes the up face

M

Turn the middle layer between L and R as if you were doing an L' move

E

Turn the middle layer between U and D as if you were doing a D move

S

Turn the middle layer between F and B as if you were doing an F move

You can also use parentheses to group moves together, such as (R U R') or (F2 U2). You can also use numbers to indicate how many times to repeat a move or a group of moves, such as R2 U2 (R U R')3. You can also use a dot to separate moves, such as R U R' . F U F'. However, these are optional and not always necessary.

## Beginner's method

Now that we know how to describe the cube and its moves, we can start solving it using a simple and easy method that consists of seven steps. This method is also known as the layer-by-layer method, because it solves the cube one layer at a time. Here are the steps:

Make a white cross on the first layer: The goal of this step is to place four white edges on the top layer, forming a cross shape. To do this, you need to find a white edge on any face of the cube, and then move it to the top layer by using one of these three cases:

Case 1: The white sticker is on the bottom face (D)

Case 2: The white sticker is on the side face (F, B, L, or R)

Case 3: The white sticker is on the top face (U)

Solution: Turn the bottom layer (D) until the white edge is under its matching center. Then do F2 to bring it up to the top layer.

Solution: Turn the side face (F, B, L, or R) until the white edge is on the bottom layer (D). Then follow Case 1.

Solution: Turn the top layer (U) until the white edge is above its matching center. Then do R U R' or L' U' L to bring it down to the side face. Then follow Case 2.

Repeat this process for all four white edges until you have a white cross on the top layer. Make sure that each white edge matches with its center color on the side faces. For example, if you have a white and green edge, it should be between the white center and the green center.

Insert the white corners on the first layer: The goal of this step is to place four white corners on the top layer, completing the first layer. To do this, you need to find a white corner on any face of the cube, and then move it to Make a yellow cross on the last layer: The goal of this step is to place four yellow edges on the top layer, forming a cross shape. To do this, you need to look at the top face and identify one of these four cases:

Case 1: No yellow edge on the top face

Case 2: One yellow edge on the top face forming a dot

Case 3: Two yellow edges on the top face forming an L shape

Case 4: Two yellow edges on the top face forming a line

Solution: Do this algorithm from any angle: F R U R' U' F'.

Solution: Do this algorithm from any angle: F R U R' U' F'. Then follow Case 3 or Case 4.

Solution: Do this algorithm with the L shape in the top left corner: F R U R' U' F'. Then follow Case 4.

Solution: Do this algorithm with the line horizontal: F R U R' U' F'. You have made a yellow cross.

Orient the yellow corners on the last layer: The goal of this step is to rotate the four yellow corners on the top layer so that they have the yellow sticker facing up. To do this, you need to look at the top face and identify one of these four cases:

Case 1: All four yellow corners are oriented correctly

Case 2: One yellow corner is oriented correctly

Case 3: No yellow corner is oriented correctly, but two are in a diagonal line

Case 4: No yellow corner is oriented correctly, but two are next to each other

Solution: You have oriented all the yellow corners. Skip this step.

Solution: Hold the cube with the correct corner in the top right corner of the front face. Then do this algorithm: R' D' R D. Repeat this algorithm until all the yellow corners are oriented correctly.

Solution: Hold the cube with the diagonal line horizontal. Then do this algorithm: R' D' R D. Repeat this algorithm unti