### Instant Insanity

We have a set of four very innocent-looking cubes - each face coloured red, blue, green or white - and they have to be arranged in a row so that all of the four colours appear on each of the four long sides of the resulting cuboid.

### Cubic Net

This is an interactive net of a Rubik's cube. Twists of the 3D cube become mixes of the squares on the 2D net. Have a play and see how many scrambles you can undo!

### Air Nets

Can you visualise whether these nets fold up into 3D shapes? Watch the videos each time to see if you were correct.

# Solving the Net

## David Shi from Gunn High School submitted a very full explanation of solving cubes and the net. In his explanation he uses a different notation used by Rubik's cube experts.Well done David!

#### David came up with these combinations which give us a simple effects on the net:

YPPPWWYYYPBB
YPPPWWYYYPBB
PYYYWWPPPYRR

PWWWYYYWPPPWWWYRRRWWWRWWWRRRWWR

David then proceeded to tell us how to solve a full Rubik's cube. He uses official cube notation in which the cube is held in a fixed orientation and the Left, Right, Front, Top faces are called L, R, F and U. All moves are clockwise unless they have a ', which means move anticlockwise. He notes that in this notation the solve for the first part of the problem would be RUR'F'RUR'U'R'FR2U'R'U'.

• Method 1 (beginner method ): To solve the edges of a cube, one would have to use a series of algorithms. Most professional cubers solve the white side first. one want to get a cross first, which is like a T. If a white piece is on the last layer (on a standard cube this would be yellow, but on this one, it's green), one moves the sidepieces 2 times. This depends on what side it is on. If the piece is on the blue side, move the blue face 2 times. If one white edge piece isn't on the bottom, it would either be already oriented, in the white layer, in the middle layer, or on the last layer, but facing not facing the bottom. If it is already oriented it is done. If it is on the middle layer, a 1-move turn can solve it. If it is on the last layer, but not facing the yellow (or green on this cube), a three move turn can do it. These moves are self-intuitive. The next step is to get the middle layer pieces in. one method to do this is using the "Intuitive F2L" Using four moves each, all 4 are moved in. one example is U R U' R'. The other ones is U' F' U F. Using those moves one can complete the second steps in around 25 moves. The extra few moves come from if all the edges are stuck in the second (middle) layer. To remove them, all one has to do is 3 turns (assuming the white face is on the bottom, R U R' will do it). Now it is for the last two steps. There are 4 basic shapes that are formed on the last layer. One is the cross, the line, a dot, or a "lower case R" shape. If it is the cross, it is done for now. If it is a lower-case R shape, the algorithm to make it a cross is F U R U' R' F as long as one faces the R away and towards the left. If it is a line, the algorithm is F R U R' U' F'. It needs to be faced horizontally. If the shape is a dot, one would needs to repeat the two algorithms listed above. Turn the cube so that two pieces are correctly aligned in a row. Then do the move U R U' R U2 R'. This finishes the cube. If no two pieces in a row are correctly oriented, repeat that move twice and the cube is done.
• Method 2 (for people that know how do solve a cube, using a beginner method ): Solve the first layer cross. All pieces should be correctly oriented. Skip the corners. Then use the intuitive F2L for the second layer pieces. That means you basically do the second half of the second layer algorithm. If you do regular F2L, move to the next method. If you do zb-F2L, I don't even know why you are reading this, as you are very advanced, and you should be one of the top in the world. For the last layer, get the cross like usual. If you do edges first (as in orient edges first), you have it easy and you should just get them correctly oriented. If you corners first, switch the corners and finish the cube. You can skip the orient last layer step.
• Method 3 (for people that can solve a sub 20 ): If you can solve a sub-20, chances are that you either do CFOP, FH, or ZB. You will probably finish the cube faster than doing any of the above steps. This is because you are probably already used to finding F2L pairs and looking ahead.