# Questions tagged [rubiks-cube]

For questions about the Rubik's Cube and its variations.

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### Why is a single-corner twist not a valid position on a Rubik's cube?

For those of you familiar with the solution to the Rubik's cube, you will know that a single-corner twist is not a valid position. It can neither be attained by scrambling, nor can it be solved if it ...
37k views

### Is it possible to use one sequence of moves to solve the Rubik's cube from any position?

Is there a sequence of moves that can be repeated over and over again which can solve any legal position the Rubik's Cube? If so what is it, and if there's more than one, what's the shortest? If not, ...
6k views

### How can I switch 2 yellow corners that are on the same face from a 3x3 cube?

How can I switch there two corners?
54k views

### Swap the edges in a solved Rubik's cube

I have a rubik cube, which always have two swapped edges in the last layer. No matter which color I start with, there are always two edges in the last layer which remained swapped with each other. ...
11k views

### How do I become a sub-30 cuber?

I am a sub-50 cuber right now. I am currently using the Fridrich method, I take about 2-5 secs to solve the cross and I am learning the 21 PLL algorithms. I am learning one or two PLL every day. I am ...
51k views

### How can one solve a Rubik's cube without relying on guides/algorithms?

I am wondering who is able to solve Rubik's cube just by thinking without knowing the rules behind it. As far as I know the inventor Ernő Rubik was professor of architecture and he intended to help ...
14k views

### Rubik's cube 4x4 parity moves

Note: since asking this question I've purchased several other twisty puzzles and now regret taking the "look up algorithms online" approach to solving - in the end I get much more enjoyment from the ...
4k views

### How many distinct unsolvable Rubik's cubes exist?

I wanted to answer this question: Why can't I have only one edge piece flipped on a 3X3 Rubik's cube? by saying that it is homomorphic to the illegal state in this question: Why is a ...
3k views

### Why can't I have only one edge piece flipped on a 3X3 Rubik's cube? [duplicate]

I was using the beginner method to deliberately solve a 3X3 cube with one edge piece flipped. But, by the time I got to the top I discovered that I couldn't solve it with only one edge flipped. I had ...
812 views

### Rubik's cube 4x4x4

I have only two sides that are not right but the other two are right... everything but that has done. How do I complete this 4x4x4 Rubik's cube?
1k views

### One Edge Piece Faced The Wrong Way

What is the minimum number of turns needed to solve a rubik's cube with one edge piece faced the wrong way on the 3rd layer? Example
195k views

### What is the best method of scrambling a rubik's cube?

If I wanted to solve a physical Rubik's cube multiple times, for practice, what is the best, most random way, to scramble the solved cube? The best way I can think is to hold it behind my back and ...
18k views

### Why does the 4x4 Rubik's cube have parity cases, while the 3x3 does not?

I'm a little uncertain as to why these two parity situations occur on the 4x4 Rubik's cube. The first parity case that can occur is this one, where an edge is simply flipped upside down: The ...
3k views

### Turn 4x4x4 Rubik's Cube into 3x3x3 Rubik's Cube

I have a 4x4x4 Rubik's Cube, but all I want is a normal 3x3x3 Rubik's Cube. Luckily, I also have an unlimited supply of small pieces of tape. Each piece of tape can cover the face of two neighbouring ...
8k views

### Rubik's cube without any algorithms

I am learning to solve a Rubik's cube using some algorithms (I don't completely understand why they work). I had a Rubik's cube when I was little and I remember solving it 2-3 times without using any ...
18k views

### What is the most efficient method to solve a Rubik's cube?

I know there are several different standard methods to solve a Rubik's cube, some easier, some more straightforward. It is known that the minimum number of moves to guarantee a solution is 20. Which ...
6k views

### How many cubes can we fit in?

You have a bag with many 3x3 Rubik's cubes . After solving all but one of them, you decide to play a new game. You take the unsolved cube, and start placing solved ones around it. The question: What ...
1k views

### A closed path on the Rubik's cube

Is it possible to draw a closed path on the surface of a standard $3\times3\times3$ Rubik's cube such that the path traverses each of the $54$ little squares exactly once, and such that the path ...
22k views

### How can I fix “stuck” positions on the Void Rubik's Cube (using the standard beginner's method)?

Sometimes, when solving the Void Rubik's Cube using the standard beginner method, it gets "stuck." What I mean by this is that the top edge of one face and the top edge of an adjacent face's colors ...
432 views

### On The Subject of Rubik's Cube

(This is part of a series of puzzles written for Timwi for a Secret Santa puzzle exchange, themed around various custom modules for the game Keep Talking and Nobody Explodes. No KTaNE knowledge is ...
48k views

### Rubik's cube with one disoriented corner [duplicate]

I have been trying to solve Rubik's cube using beginner's method provided here: https://ruwix.com/the-rubiks-cube/how-to-solve-the-rubiks-cube-beginners-method/ I ended up with just one last corner ...
29k views

### Solving Rubik's cube with one algorithm [duplicate]

I was wondering if it's possible to solve a Rubik's cube just iterating a single algorithm. It doesn't matter how complex the algorithm is (as long as it is less than 1 million moves), nor the time ...
6k views

### What does it mean for a Rubik's cube to be perfectly scrambled, and how do you reach it? Without doing a checker board

Can you picture the perfectly scrambled cube? A Rubik's Cube that's perfectly scrambled? How would it look? Is it even possible? The quest for the Perfect Scramble is now upon us, and I challenge you ...
20k views

### Is it possible to scramble a Rubik's cube such that no two squares of the same color are touching?

My friend always insists on scrambling my Rubik's cube "perfectly" before giving it to me to solve. According to his definition, a "perfect" scramble must have no three of the same color touching (...
7k views

### How can I swap opposite corners on the same face of a 2x2 cube?

I've been experimenting with using Y-permutations to solve the 2x2 cube as described here. I ended up with the cube solved but for a single face where the opposite corners were swapped and disoriented....
5k views

### How can I twist opposite corners on the top face of a 3x3 cube?

I have solved the bottom white layer and the second layer. I have almost solved the top layer also, but I have not able to solve the corner pieces. Normally I can solve this with the below sequence: ...
2k views

### Rubik's cube two-person game

I will define the game as follows: There are two players, the "Solver" and the "Unsolver". The Solver's goal is to return the cube to it's standard solved state. Likewise, the Unsolver's goal is to ...
2k views

### How do I solve the top yellow layer of the Rubik's cube?

I used to solve the Rubik's cube using the standard algorithm. Recently, after a long time I tried doing it again. I did revisit the algorithm to solve the Rubik's cube, but I'm stuck in the top ...
929 views

### How Random does a 3x3x3 (or other rubik cubes) need to be in speed solving?

Is there a rule/method to know how "random" should the cube be when solving it? in order for it to be a "valid" score?
66k views

### Simple 4x4x4 OLL parity algs?

I am learning to solve a 4x4x4 Rubik's cube and I think that the beginner OLL parity alg: (r U2 x r U2 r' U2 l U2 r' U2 r U2 r' U2 r') is a little too complex. ...
7k views

### Last 2 pieces in Rubik

I followed a guide in how to solve the Rubik Cube however from time ti time I incurr in a case that is not covered by guide and I obtain an almost solved Cube except for 2 pieces. Seems also the ...
2k views

### 4x4x4 Rubiks Cube strategy

With a 4x4x4 cube, it's possible to apply the same strategies as for a 3x3x3, either treating it as a 3x3x3 with a double-width middle or else as a 2x2x2 and just working on the corner "quadrants". ...
452 views

### Theoretical Question - Rubik's Cubes

I have a very basic question on Rubik's Cubes. Take any completely solved cube or skewb. Now pick out (with hand) any two similar pieces and swap their positions, without changing positions/...
123 views

### Rubik's cube from solved to specific pattern

Say I don't want to solve Rubik's cube but I want the reverse: I'm having a solved Rubik's cube (all stickers in it's right position and orientation) and I want to go from this state to a specific ...
894 views

### Rubik's cube: Last edge problems (beginners method)

When solving the Rubik's cube using the beginners method, the last step which solves the last layer edges only requires 1 step of the algorithm if one face is already completed. My problem is that ...