Questions tagged [rubiks-cube]

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

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37
votes
4answers
151k 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 ...
3
votes
1answer
418 views

How do I solve this F2L case quickly?

I have been unable to find a solution for this f2l case. It takes about 3 seconds to do, and I do it really slowly. Basically, the f2l case is solved, but the edge is inverted. The way I do it right ...
5
votes
1answer
137 views

What (if any) is the maximum possible number of pieces ina Rubik's cube?

What (if any) is the maximum possible number of pieces in a Rubik's cube---27? 64? 125? 216? 343?...or does the maximum end with 125?
3
votes
2answers
2k views

Algorithm for a single diagonal on each face of the Rubik's Cube

Right now I am trying to get the following distorted position: On each face only one diagonal is solved and the rest of the cubes are a different colour than the diagonal. For example: If I am ...
6
votes
1answer
235 views

Another 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 exactly one diagonal of each of the $54$ little squares, and such that ...
8
votes
2answers
846 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?
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.
12
votes
2answers
2k views

How many solvable permutations of the Rubik's cube exist where each color appears at least once on every side?

Every now and then, scrambling my Rubik's cube I find it in a state where every side has at least one tile in each of the six colors. For example here's a scramble I just did (obviously put through a ...
0
votes
1answer
926 views

3rd layer dilemma

i've followed the beginner's method, i've got the superior facet correct, the 1st and the 2nd layer correct. But in the third layer i always invert the colors but only got one corner right as shown in ...
6
votes
1answer
201 views

Minimum number of stickers to inspect in a Rubik cube to define a scrambled position?

This is for a robotics solver using a real cube. How many facelets must the machine check to figure out the position of everything in a scrambled cube?
6
votes
2answers
1k views

rubik's cube inside a rubik's cube

Once I completed solving Rubik's cube, a different pattern came into my mind. It was- A B B A B B A C C Here, same letters represent same colors. So is it ...
6
votes
1answer
7k 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 ...
2
votes
1answer
763 views

What is the equation to solve the puzzle box Super-CUBI 324 step

The Super-CUBI puzzle box takes 324 steps to open or close it, instructions. And uses a Trinary System. It must have a solution as it would be hard to remember all the steps to take to open it. But ...
6
votes
3answers
26k 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 "...
2
votes
2answers
495 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
368 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 ...
9
votes
1answer
500 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 ...
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 ...
8
votes
1answer
440 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
632 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
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 ...
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 ...
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 ...
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 ...