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Started by Agaliarept on Oct 30, 2020 2:56:29 PM
Question about Rubik's Cube

My eldest has just gotten a Rubik's Cube and I'm having a fit of the nostalgias...

See post #1

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Agaliarept - 30 Oct 2020 14:56:38 (#1 of 72)

His little sister managed to drop it and about 5 of the faces of the blocks have come off.

Putting them back on isn't a problem as they just click on but my question is:

Does it matter where each face goes on?

I assume you can't have a block with two faces the same colour. I've been looking online and seem to see conflicting advice.

Some sites are telling me players take their Cubes apart and reassemble them to give themselves different starting points, while another site warns about "Parity issues".

Does anyone know if they have to be in a certain place? And if so is there anything to use as a guide to reassemble?

I took it completely apart for shits and giggles and reassembled it but couldn't make it as new so am wondering if I've got some of the faces wrong.

FrankieTeardrop - 30 Oct 2020 14:58:36 (#2 of 72)

Does it matter where each face goes on?


Yes, hugely

YouGotTheMoney - 30 Oct 2020 15:00:47 (#3 of 72)

surely there's only one way to reassemble it in its completed state?

I seem to recall doing that quite a bit, back in the day, because I couldn't solve it the proper way...

dottie30 - 30 Oct 2020 15:02:34 (#4 of 72)

It's easy to solve once you have managed to get the 'white cross'.

Agaliarept - 30 Oct 2020 15:03:42 (#5 of 72)

Yes, hugely

Well as I said I can see that you couldn't have two faces with the same colour, but if there's only one way for them to go, why the removeable faces? There is the hidden screw that holds the main frame together but 12 faces are removeable and only 4 have screws.

surely there's only one way to reassemble it in its completed state?

Alas no. The pieces have little plastic guides locking them in place. There are corner ones and side ones. All corner ones will lock into all corners and same for the side pieces. Then the faces of course.

It's easy to solve once you have managed to get the 'white cross'.

So I hear. I can do the cross and usually a couple of corners on one side but then my brain stops working.

YouGotTheMoney - 30 Oct 2020 15:10:35 (#6 of 72)

> All corner ones will lock into all corners

yes, but as each face has a different colour, there's only one way you can put them together correctly. if you put a corner in the wrong way around, you'll run into trouble with the other corners/sides. no?

(I am talking about putting it back together as new, not just sticking the fallen-out bits back on properly.)

Agaliarept - 30 Oct 2020 15:20:29 (#7 of 72)

yes, but as each face has a different colour, there's only one way you can put them together correctly. if you put a corner in the wrong way around, you'll run into trouble with the other corners/sides. no?

I think that's correct. The problem really is the faces that have come off making it hard to know if a piece is in the wrong place or if the face is wrong.

FrankieTeardrop - 30 Oct 2020 15:23:36 (#8 of 72)

If you put it back together any old way, rather than correctly, how would they know the difference?

Agaliarept - 30 Oct 2020 15:28:31 (#9 of 72)

If you put it back together any old way, rather than correctly, how would they know the difference?

Heh, I did do a quick assessment of the amount of time I'm prepared to spend fixing this vs the likely hood of my hyper 8 year old ever finding out.

guess this one is really for me

YouGotTheMoney - 30 Oct 2020 15:29:28 (#10 of 72)

agalia, you'd have to take the whole thing apart and put it back together as new. I don't think there's another way.

> If you put it back together any old way, rather than correctly, how would they know the difference?

snicker

Agaliarept - 30 Oct 2020 15:36:25 (#11 of 72)

agalia, you'd have to take the whole thing apart and put it back together as new. I don't think there's another way.

I did that but it's still the faces that are the problem.

How do I tell which cubes they fell off of? Like I say, no cube with two faces the same colour is easy but other than that?

FrankieTeardrop - 30 Oct 2020 15:36:52 (#12 of 72)

I've already said - it doesn't matter.

Agaliarept - 30 Oct 2020 15:37:53 (#13 of 72)

I've already said - it doesn't matter.

And we've established this is really for me. I won't sleep knowing it's sat there in a state that renders it unbeatable.

limegreen - 30 Oct 2020 15:40:08 (#14 of 72)

It matters. There will be some starting points that can't be solved to the correct solution. e. g. When solved white and yellow are opposite. So any starting point with white and yellow sharing an edge in a mini cube is no good.

If you don't know what you've put on wrong can you take all the mini faces off and put it back together sokved using an online picture. Then mix it up.

DonkeyOT - 30 Oct 2020 15:43:43 (#15 of 72)

My eldest has just gotten a Rubik's Cube.

Are we to assume that you are an inhabitant of one of our former colonies?

cozzer - 30 Oct 2020 15:51:12 (#16 of 72)

I don't think it matters. Consider this: if you put one cube back in the 'wrong' place, it means there is a corresponding cube that has been put where the first cube should have been. But the whole point of a Rubik cube is that you can swap the positions of two cubes - that's how you solve it. so even if you put the two cubes in the 'wrong' positions, you can just swap them during the normal process of solving it.

Agaliarept - 30 Oct 2020 16:02:50 (#17 of 72)

Are we to assume that you are an inhabitant of one of our former colonies?

Not an inhabitant but I was raised them.

USAF family. We just happened to settle in the UK. Americanisms slip in now and again.



so even if you put the two cubes in the 'wrong' positions, you can just swap them during the normal process of solving it.

That's what a couple of sites seemed to be saying. So as long as I avoid the same colour on one cube it should be ok?

What about the centre tiles. They are all removeable, with the corner pieces one removeable face and two static stickers, does this mean the centre tiles would have to be in a related order?

tasselhoff - 30 Oct 2020 16:14:44 (#18 of 72)

This is hurting my head. Can't you just get a new one?

Agaliarept - 30 Oct 2020 16:18:06 (#19 of 72)

This is hurting my head. Can't you just get a new one?

Haha! Totally have this as plan b. Looking more and more likely.

cozzer - 30 Oct 2020 16:18:17 (#20 of 72)

So as long as I avoid the same colour on one cube

I don't understand this. it's been a long time since I looked at a Rubik cube, but my memory is that the faces on each cubelet are fixed. So there are 8 corner cubelets with 3 colours each, 12 edge cubelets with 2 colours each, and 6 middle cubelets with a single colour. But the edge cubelets, the two faces are connected, so those colours are stuck (unless you peel the labels off).

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