Cube RoomCUBE ROOMThis guide explains the selected example in Cube Room's top-corner positioning lesson. It uses a common T-perm sequence. The aim is not merely to remember a long string of letters, but to recognize which corners must swap, what is already solved and what the full sequence should preserve.
Check the starting state
The first two layers are complete and the top is all yellow. With yellow up and blue front, the two top corners on the left already match the red center. The front and back top corners on the right need to swap. Check all three colors of each corner; a matching pair of side stickers is not necessarily aligned with the correct center.
If the whole top is offset, prepare the setup first. If the yellow face is incomplete, return to corner orientation. A permutation algorithm should not be used as a tool for turning yellow corners upward.
Group the fourteen moves
R U R' U' R' F R2 U' R' U' R U R' F'For practice, group this as R U R' U', then R' F R2 U', then R' U' R U R' F'. The right and top layers start the sequence, the front joins in, and the final moves restore the working layers. These groups are memory aids; do not insert extra setup moves between them.
R2 is a half turn, and the final F' closes the sequence. Losing your place is a common problem in a long algorithm. At first, let each deliberate button press correspond to one recorded move instead of aiming for continuous speed.
Why the cube may still be unsolved afterward
This sequence swaps two edges as well as two corners. For this example, expect all four top corners to reach their correct positions while preserving the first two layers and yellow face. You do not yet require every top edge to be solved.
Cube Room checks the actual corner stickers and then offers the next group. Once the corners are correct, do not repeat the T-perm simply because you expected this one sequence to finish the entire cube.
Move from following to recognizing
On your first demonstration, pause at the start and end to compare the top corners on all four sides. Next, perform the whole group yourself. Then try a changed top-layer setup: restore the two correct corners to the reference position before applying the sequence.
For a prerequisite question, identify what is wrong instead of forcing the algorithm. After passing the corner goal, continue to the final three-edge cycle. Other corner arrangements require learning their own treatment; this one example is not a universal answer to every last-layer permutation.
Now, make it click.
Open the related exercise. Check the case and orientation before making the moves. Reading does not change your cube; practice progress is saved in this browser.
Open the exercise →Sources and further reading
Cube Room wrote this guide around its own practice examples. The sources below help verify basic concepts or provide further study; this is not a verbatim translation of their material. Cube Room is not affiliated with these providers.