Questions tagged [rubiks-cube]

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

Filter by
Sorted by
Tagged with
11
votes
3answers
36k views

What is the Official notation on rubik's revenge(4x4)?

When solving a 4x4 cube you have specific notation to inner and outer lines, like R = Clockwise outer right and r = Clockwise ...
6
votes
3answers
27k 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 ...
2
votes
1answer
3k views

Question about a “sexy move” tutorial

I'm using this tutorial to learn solving the cube with "sexy move" - https://sites.google.com/site/cubetutorials101/3x3-rubik-s-cube/3x3-beginner. It all goes well until the final step where it says "...
15
votes
2answers
10k 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 ...
8
votes
4answers
46k 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. ...
2
votes
2answers
503 views

How many stickers need to be cycled on a Rubik's cube before the chance it's unsolvable drops below 11/12?

This is a question I'm actually looking for the answer to. It's known that when you swap individual pieces on a Rubik's Cube, the probability that afterwards it will be possible to solve is 1/12. ...
-1
votes
1answer
373 views

How to cycle these 3 minicubes on a Rubik's cube?

Someone has fiddled with my Rubik's cube and messed it up only very minorly. Exactly 3 minicubes are out of place: the up-front, up-back, and down-front edge minicubes need to be cycled round. I ...
-1
votes
3answers
599 views

Is this Rubik's Cube position possible?

A solved 3x3 Rubik's Cube has red on the top face, green on the right face, and yellow on the front face. There is one corner piece belonging to these three faces, with those three colours. I want to ...
9
votes
1answer
503 views

What is God's Number for the Rubik's Picture Cube?

It's been well known for a few years now that every Rubik's Cube scramble can be solved in 20 moves. However, this is only for the case where the orientation of the centers is not taken into ...
1
vote
5answers
5k views

Solved Rubik's 3x3x3 - should I do the 4x4x4 next? [closed]

For years I have been trying to solve the 3x3x3. Over the last several weeks I was determined to do it. With the help of several online tutorials and video's I can now solve it. My average is ...
6
votes
2answers
2k views

Is solving the Rubik's cube face by face even possible?

Many methods, if not all, recommend solving it layer by layer, but is it actually possible to solve it face by face? If so, explain how you would do this, if not, prove it impossible.
5
votes
3answers
5k 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 ...
8
votes
1answer
447 views

What is the meaning of a “tetrad twist” in Thistlethwaite's algorithm?

I am having difficulty understanding the third stage of Thistlethwaite's algorithm. I am using http://www.jaapsch.net/puzzles/thistle.htm. The third stage has a factor of [8!/(4!4!)]2 *2*3. This ...
5
votes
2answers
637 views

What to do when the official Rubik's cube solving sequence breaks?

So, the official guide shows you exactly how to solve the white cross, first layer, etc. but on the second layer, assume you've completed every little square but one (and edge) and that there's 2 ...
0
votes
2answers
4k views

Rubik's cube 19 move Solution [closed]

All Rubik's cube positions can be solved in 20 moves or less; http://www.cube20.org/ What's one such position that requires 19 moves to solve, please give the faces, and the moves to solve.
15
votes
4answers
32k 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, ...
32
votes
7answers
15k 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 ...
9
votes
2answers
8k views

What is the shortest known rubik's cube algorithm?

This is related to this question, but different. I'm not asking for the least number of moves needed, nor for pointers on how to use fewer moves. In Singmeister's notes (an 80's book!) there is ...
2
votes
1answer
4k views

Confused about step 5 of official Rubik's 3x3 Cube solution

Solution guide: http://rubiks.com/uploads/general_content/Rubiks_cube_3x3_solution-en.pdf I can get to this point pretty reliably now, but when I try the method shown I'm just as likely to go from ...
6
votes
1answer
8k views

Maximal number of steps needed to solve 2x2x2 Rubik's Cube

What is the maximal number of steps that a computer (using the fastest algorithm) would need to solve an arbitrary 2x2x2 Rubik's Cube configuration? Are there any other known algorithms that will ...
10
votes
2answers
2k views

5x5x5 Rubik's Cube Smiley

I did some turning on my 5x5x5 Rubik's Cube and I now have the cube like on the image below. 4 times a smiley -_- and 2 times a solved plane. But I have no idea how ...
13
votes
2answers
3k 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 ...
7
votes
1answer
2k 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 ...
8
votes
2answers
851 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?
19
votes
5answers
17k 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 (...
10
votes
2answers
3k views

How do I solve the C4Y 3x3x7?

I have been solving the Rubik's Cube 2x2x2, 3x3x3, 4x4x4 and 5x5x5, and because things are very similar I thought a 6x6x6 wouldn't be a challenge much. So I bought the C4U 3x3x7 - see image. What I ...
5
votes
3answers
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". ...
38
votes
4answers
158k 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 ...
14
votes
3answers
17k 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 ...
12
votes
9answers
71k views

Flip edge in Equator layer

If you use the Beginners' Method to solve the Rubik's cube, and solve the equator layer (the layer between the U-layer and D-layer), it can happen that one of the edges is flipped, like this: ...
12
votes
4answers
933 views

How to determine if a Rubik's Cube is sufficiently scrambled?

Once I solve a Rubik's Cube I obviously want to start again. I just scramble it until it seems to be enough; however, sometimes when I then solve it, I can skip entire steps from the beginner's method....
9
votes
2answers
2k views

How to get started in speedcubing?

I learned how to solve a Rubik’s cube with the normal beginner method. Now I wanted to know how to get from this to speedcubing. Is speedcubing just executing the steps really fast? I don't think so. ...
15
votes
3answers
5k views

What is the maximum “minimum number of steps” needed to solve a rubiks cube?

If an algo X outputs the minimum "number of moves" (not the actual moves, just their count) to solve an input configuration, what's the maximum number ...
31
votes
4answers
19k views

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 ...
9
votes
2answers
21k 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 ...