[Help Thread] Please help me with this world map 8x8 picture cube!!!

[quan2206]

Please help me, i don't know how to pair these four blocks, yellow to yellow, cyan to cyan, I'm have stucked hear for 2 week, this is the last step to make center.

 

[cubemastery321]

Welcome — and good work getting this far, the last centers are the fiddly bit on a picture cube.

The key thing is you can't just swap those two pairs directly — a two-piece swap isn't possible, so you need to cycle three center pieces instead.

Try this: hold the cube with one of those centers on top and the other on the front. Turn an inner layer (the layer just in from the face) to bring a yellow piece from the front center up to the top, turn the top once to put that piece where it belongs, then turn the inner layer back and turn the top back. That moves three center pieces in a cycle. Repeat it with a different setup turn on top first if needed, and the last four should fall into place without breaking the centers you've already finished.

Two things that trip people up on a picture cube like this: match the actual map detail, not just the color — a yellow piece can be in the right color center but the wrong spot in the picture — and check the center pieces are the right way round, since the map lines need to line up.

If you try that cycle and a piece still ends up in the wrong center, tell us which colors are where and we can walk through the setup from there.

 

[quan2206]

Welcome — and good work getting this far, the last centers are the fiddly bit on a picture cube.

The key thing is you can't just swap those two pairs directly — a two-piece swap isn't possible, so you need to cycle three center pieces instead.

Try this: hold the cube with one of those centers on top and the other on the front. Turn an inner layer (the layer just in from the face) to bring a yellow piece from the front center up to the top, turn the top once to put that piece where it belongs, then turn the inner layer back and turn the top back. That moves three center pieces in a cycle. Repeat it with a different setup turn on top first if needed, and the last four should fall into place without breaking the centers you've already finished.

Two things that trip people up on a picture cube like this: match the actual map detail, not just the color — a yellow piece can be in the right color center but the wrong spot in the picture — and check the center pieces are the right way round, since the map lines need to line up.

If you try that cycle and a piece still ends up in the wrong center, tell us which colors are where and we can walk through the setup from there.

Can you instruct me with video or formula, I haven't figure your method yet? I usually learn by Youtube video, so this time without it, this cube make me so confused. Sorry my English is not very good.

 

[quan2206]

Welcome — and good work getting this far, the last centers are the fiddly bit on a picture cube.

The key thing is you can't just swap those two pairs directly — a two-piece swap isn't possible, so you need to cycle three center pieces instead.

Try this: hold the cube with one of those centers on top and the other on the front. Turn an inner layer (the layer just in from the face) to bring a yellow piece from the front center up to the top, turn the top once to put that piece where it belongs, then turn the inner layer back and turn the top back. That moves three center pieces in a cycle. Repeat it with a different setup turn on top first if needed, and the last four should fall into place without breaking the centers you've already finished.

Two things that trip people up on a picture cube like this: match the actual map detail, not just the color — a yellow piece can be in the right color center but the wrong spot in the picture — and check the center pieces are the right way round, since the map lines need to line up.

If you try that cycle and a piece still ends up in the wrong center, tell us which colors are where and we can walk through the setup from there.

Are you talk about Commutator method? If it is it, I have tried many time, it still wrong like the picture I have posted, the one of this pair lied on other pair, and the one of other pair lied on this pair.

 

[Cubing_Grandson]

Please help me, i don't know how to pair these four blocks, yellow to yellow, cyan to cyan, I'm have stucked hear for 2 week, this is the last step to make center.

I didnt know there are 8x8 versions of this, I've only seen the 2x2 globe and 3x3/4x4 world map

 

[Jacck]

I may be wrong but if you want to swap yellow with yellow and blue with blue, then it is impossible.
Explanation 1: if you would disassemble the cube you would see that the two yellow ones are not the same shape, they are mirrowed - and therefore won't fit in the other's place. Or a blindcuber would say: they don't belong to the same oblique-set.
Explanation 2: it is impossible to move one yellow "on" the other with a F-turn.

I don't know how the rest of your cube looks like (are there pictures, too?). The best thing I could get with twizzle was to swap a yellow one with the diaginal blue one (they are built with the same shape and could be moved "on" each other with an F2). But I could only do that by swapping two centers on the white face, too (if there is no picture there, if all centers are white, you won't see that).

To make it more clear the first part is to get four different colored centers on front.

 Twizzle link 

// get 4 different colors on front 
[D, 3F' 4U' 3F]
[L, 4B' 3R 4B]
[R, 4F' 3L' 4F]
3R2 F 4L2 F' 3R2 F 4L2 F'
// diagonal swap on green side downleft to upright and on white side backleft and rightback
[4U' 3B' 4U, F2]
[U', 3B' 4U' 3B]
// diagonal swap on green side upleft to downright and on white side frontleft and leftback
[4U' 3F 4U, F2]
[U', 3F 4U' 3F']

So if you ask me: your problem with the cube must be something else ...

 

[quan2206]

I have passed that problem, and now, I am stuck at this, I don't know how to switch position of these two piece (red line and yellow line), Every time try the commutators formula, it's always ư

 

[quan2206]

I may be wrong but if you want to swap yellow with yellow and blue with blue, then it is impossible.
Explanation 1: if you would disassemble the cube you would see that the two yellow ones are not the same shape, they are mirrowed - and therefore won't fit in the other's place. Or a blindcuber would say: they don't belong to the same oblique-set.
Explanation 2: it is impossible to move one yellow "on" the other with a F-turn.

I don't know how the rest of your cube looks like (are there pictures, too?). The best thing I could get with twizzle was to swap a yellow one with the diaginal blue one (they are built with the same shape and could be moved "on" each other with an F2). But I could only do that by swapping two centers on the white face, too (if there is no picture there, if all centers are white, you won't see that).

To make it more clear the first part is to get four different colored centers on front.

 Twizzle link 

// get 4 different colors on front 
[D, 3F' 4U' 3F]
[L, 4B' 3R 4B]
[R, 4F' 3L' 4F]
3R2 F 4L2 F' 3R2 F 4L2 F'
// diagonal swap on green side downleft to upright and on white side backleft and rightback
[4U' 3B' 4U, F2]
[U', 3B' 4U' 3B]
// diagonal swap on green side upleft to downright and on white side frontleft and leftback
[4U' 3F 4U, F2]
[U', 3F 4U' 3F']

So if you ask me: your problem with the cube must be something else ...

I have passed that problem, and now, I am stuck at this, I don't know how to switch position of these two piece (red line and yellow line), Every time try the commutators formula, it's always wrong

 

[Jacck]

(We already know now that you can't switch only two pieces.)
If I'm right, then the piece three places behind the yellow one looks exactly the same as the yellow one itsself (only grey and no picture on them). So we can cycle this one, the red one and the yellow one together:

 Twizzle link 

3F 3D 3F' U 3F 3D' 3F' U'

// written as a commutator
//[3F 3D 3F', U]

You could take the diagonal piece of the yellow, too. Then use an U2 instead of the U and U'.

If the yellow one has a bit of picture, then you could switch yellow and red while switching the 2 pictureless ones in the back (similar like I did in the last post). If you have problems with that, then post it.

 

[quan2206]

(We already know now that you can't switch only two pieces.)
If I'm right, then the piece three places behind the yellow one looks exactly the same as the yellow one itsself (only grey and no picture on them). So we can cycle this one, the red one and the yellow one together:

 Twizzle link 

3F 3D 3F' U 3F 3D' 3F' U'

// written as a commutator
//[3F 3D 3F', U]

You could take the diagonal piece of the yellow, too. Then use an U2 instead of the U and U'.

If the yellow one has a bit of picture, then you could switch yellow and red while switching the 2 pictureless ones in the back (similar like I did in the last post). If you have problems with that, then post it.

I am try to solve it and then, it come to this, how to switch position of the red line and cyan line

 

[Jacck]

You will need a swap of two different center-pieces, too. Like:

 Twizzle link 

// get 4 different colors on top
[3U 3R' 3U', R]
[3D' 3F 3D, B]
[3D' 3F' 3D, F]
[3U' 3L 3U, L']

[3L: [3F 3D 3F', U]] // cycle blue-red-green
[3B: [3L 3D 3L', U]] // cycle red-green-orange

Or you take two other pieces as "helper" anywhere on the cube.

I think important is: there must be other pieces to be swapped at the moment - or your cube has been dissambled and then assembled wrong. The difference to a normal 8x8x8 is that on a normal 8x8x8 it doesn't matter where exactly a white center-piece goes or has been assembled (it has 4 places to go and you won't see a difference in the end). But on a picture cube every centerpiece has only one place where it fits.

 

[quan2206]

You will need a swap of two different center-pieces, too. Like:

 Twizzle link 

// get 4 different colors on top
[3U 3R' 3U', R]
[3D' 3F 3D, B]
[3D' 3F' 3D, F]
[3U' 3L 3U, L']

[3L: [3F 3D 3F', U]] // cycle blue-red-green
[3B: [3L 3D 3L', U]] // cycle red-green-orange

Or you take two other pieces as "helper" anywhere on the cube.

I think important is: there must be other pieces to be swapped at the moment - or your cube has been dissambled and then assembled wrong. The difference to a normal 8x8x8 is that on a normal 8x8x8 it doesn't matter where exactly a white center-piece goes or has been assembled (it has 4 places to go and you won't see a difference in the end). But on a picture cube every centerpiece has only one place where it fits.

yeah, that is the only difference but also is the big problem of the picture cube, now I'm stuck at the case how to switch two block on the same face.

 

[bcube]

Since the reader can not see the effect of the move sequence showed by Jacck in post no. 9 above, I will try to make it more clear using Supercube.

In principle, the move sequence works the same on both the 8x8x8 and 7x7x7 cubes, so I will use a 7x7x7 simulator.



Hit the Play forward button to play the sequence. After the sequence is finished, see the effect and don't reset the simulator - hit the Play forward button again instead. Repeat for the third time to see how the 3 center pieces are being cycled.

One thing that might or might not be related: as outlined in this post, you can simulate your current cube state for 2x2x2 - 7x7x7 world map picture cubes (i.e. including identical pieces). When we see your current cube state, we can show you the solution for that specific cube state.