Questions tagged [rubiks-cube]

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

38
votes
4answers
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 ...
37
votes
4answers
149k 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 ...
32
votes
12answers
34k 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 ...
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 ...
31
votes
4answers
18k 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 ...
30
votes
2answers
1k views

Rubik's Chess Puzzle

This puzzle is part of the Fortnightly Topic Challenge - "Unconventional Tag Fusion". Last week I found out that Puzzle Prime Co. have invented new type of puzzle - Rubik's Chess. The goal is simple -...
24
votes
8answers
5k 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 ...
21
votes
1answer
4k views

Will tiles on a solved rubik's cube always be in the same position?

When a rubik's cube is solved, will the tiles always be in the same position? For example, if you were to write the number 1-9 on one of the sides before scrambling it, will the numbers always be in ...
19
votes
5answers
16k 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 (...
15
votes
2answers
9k 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 ...
15
votes
4answers
31k 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, ...
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 ...
14
votes
3answers
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 ...
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 ...
14
votes
4answers
2k views

Where is my girlfriend?

Well, I'm really, really sorry to everyone who has spent time trying to tackle this puzzle. I made a HUGE mistake in the presentation. I honestly don't know how I managed to make a mistake this big, ...
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 ...
13
votes
1answer
504 views

Rubic cube's face into date

Solve this rubic cube's face into date For puzzle masters who can not see pictures / color blind ...
12
votes
3answers
7k 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 ...
12
votes
1answer
877 views

Can you make a Rubik's Cube pattern with a 4 color flower on every side?

I enjoy putting my cubes into aesthetically interesting patterns (using legal moves, of course). I'm trying to make a pattern where each side has exactly 4 different colors in the following ...
12
votes
4answers
888 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....
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 ...
11
votes
8answers
67k 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: ...
11
votes
2answers
622 views

Password in Rubik's cube

Alice needs a strong password, but she has terrible memory - so she have decided to hide it in a Rubik's cube she happens to carry around all the time Alice starts with a solved 5x5x5 Rubiks Cube She ...
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 ...
10
votes
3answers
4k views

How do I memorize parity algorithms for higher-order Rubik's cubes?

I know how to solve a Rubik $4\times4\times4$ or $5\times5\times5$ or bigger, but I have problem with a specific algorithm: the parity error. What's the shortest parity algorithm for $n\times n\times ...
10
votes
2answers
2k views

3x3x3 Rubik's Cube Illegal State

After I learned how to solve a 3x3 Rubik's Cube and a 4x4 Rubik's Revenge, I began challenging myself to solve the cubes to different states rather than the normal solid sides. For instance, I'd solve ...
10
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 ...
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 ...
9
votes
6answers
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 ...
9
votes
1answer
1k views

Can you build a Rubik's cube?

Given an all black 3x3 Rubik's cube. You are provided with 54 stickers (9 pieces per color) and then blindfolded. If you put the stickers on the Rubik's while being blindfolded. What is the ...
9
votes
1answer
4k views

What's wrong with this parity?

Here you see my Rubik's $10\times10\times10$ I don't know how to solve this using an algorithm, also the same thing happens to my $6\times6\times6$. What algorithm should I use? (The whole cube is ...
9
votes
4answers
459 views

What are some benefits of solving the rubiks cube?

I was wondering what are some benefits of speed solving for the person involved in this hobby? I am looking for the information regarding the cognitive benefits of solving the rubiks cube. I found ...
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. ...
9
votes
2answers
20k 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 ...
9
votes
3answers
588 views

Turn 4x4x4 Rubik's Cube into 2x2x2 Rubik's Cube

Idea shamelessly stolen from this question. I have a 4x4x4 Rubik's Cube, but all I want is a 2x2x2 Rubik's Cube. Luckily, I also have an unlimited supply of small pieces of tape. Each piece of tape ...
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 ...
9
votes
1answer
495 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 ...
8
votes
4answers
44k 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. ...
8
votes
1answer
566 views

Flags in all faces in rubik cubes

Anyone knows if it is possible to obtain a diferent country flag in all six faces of the Rubik Cube? Thanks
8
votes
2answers
841 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?
8
votes
3answers
521 views

Separating the Pieces of a Rubiks Cube

I recall coming across this problem in one of my classes senior year of high school. (We only did the first part). Easy (and probably somewhere on the internet) Taking a standard 3x3x3 Rubik's ...
8
votes
2answers
12k views

How to Flip Adjacent Edges like this

Only these two edges are misplaced. Any algorithm to solve this?
8
votes
2answers
1k views

How do I become a sub-15 cuber?

Right now, I can solve a Rubik's Cube with an average of 17 - 20 seconds. Sometimes, I may get 15 or 16 second and my record is 12. I am currently using the Fridrich method and below is how long I ...
8
votes
1answer
437 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 ...
7
votes
4answers
1k 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 ...
7
votes
1answer
505 views

Illegal patterns for the Rubik's cube

It is known that if you take apart the Rubik's cube and then reassemble it randomly, you will end out in one of $12$ cases, among which only one is solvable. The others result in having (1) one piece ...
7
votes
1answer
157 views

Unsolving a Rubik's Cube

A few days ago I picked up a solved Rubik's Cube that I had abandoned due to forgetting how to solve it, and started turning the faces to make nice patterns. A few minutes later, I'd made one - each ...
7
votes
2answers
400 views

How to get faster at 3x3

I am new to speed cubing and would like to figure out how to get faster at cubing based on my personal stats. Which aspect should I focus on? Which principles would be the most useful for me (...
7
votes
1answer
1k views

Is there a Rubik's scramble generator for the top layer only?

I want to practice solving the last layer, but the online scramblers I've seen are full cube only. Is there a Rubik's scramble generator for the top layer only?
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 ...