Front view
All corner pairs are solved. Find the solved edge bar and determine whether the other three edges must cycle clockwise to reach their centers.
U-perm family · PLL Ua
Ua-Perm: recognition, algorithms and execution trainer
Ua-perm keeps all corners solved and cycles three last-layer edges. It is an essential two-look PLL case and a good place to compare RU and M-slice execution styles.
IntermediateLearning order #3Interactive 3D
Primary algorithm
R U' R U R U R U' R' U' R2Time an execution ↓Interactive demonstration
Inspect and play the case from four angles
Change the viewpoint without changing the case. Then play the selected algorithm turn by turn.
Viewing angle
Algorithm
Recognition
Recognize Ua-Perm from several angles
Right view
Use color order around the side centers to determine cycle direction. This prevents guessing Ua versus Ub from a memorized arrow.
Back view
When the solved bar is at the back, the primary algorithm can often begin immediately. Confirm the three front edges cycle in the Ua direction.
Left view
Read the opposite side colors and check that corners remain solved. A corner mismatch means the case is not a U perm.
Algorithms
Primary and alternatives
Primary
R U' R U R U R U' R' U' R2Recommended starting point for reliable recognition and execution.
M-slice alternative
M2 U M U2 M' U M2Compact and fast once M and M-prime finger tricks are reliable.
Left-hand mirror frame
y2 R U' R U R U R U' R' U' R2 y2Uses the primary RU algorithm from the opposite solved-bar position.
Setup moves
Build the exact case
R2 U R U R' U' R' U' R' U R'Apply the inverse setup and randomize U. Practice calling Ua or Ub aloud before execution so direction recognition is measured separately from the algorithm.
Finger tricks
Execute as one controlled phrase
- For the RU algorithm, begin with R U' using the left index for U prime when comfortable.
- Keep the right hand flowing through the repeated R U rhythm instead of resetting after each R.
- Use controlled U' flicks in the second half and align the layers before the final R2.
- For the M alternative, practice M and M prime separately before attempting the full sequence at speed.
Common mistakes
What usually breaks the case
- Confusing Ua with Ub because cycle direction was memorized from only one front.
- Using a whole-hand grip change for every repeated R turn in the RU algorithm.
- Pulling M2 unevenly and leaving the slice misaligned before U.
- Ignoring final AUF because the edge cycle feels visually complete.
Execution-time trainer
Time repeatable executions, not one lucky run
Apply the setup, press the timer button or Space to start, then press again when the algorithm is complete. Times are stored locally; signed-in attempts also contribute privately to aggregate statistics.
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Short demonstration video
Ua-Perm in one quick visual pass
Use the clip for a compact overview, then return to the interactive 3D player to control angle and playback.
Difficulty and order
Intermediate · recommended case #3
Ua is part of two-look PLL and appears frequently. It teaches directional edge-cycle recognition and gives a meaningful choice between RU and M-slice algorithms.
#3recommended order
Quick answers
Frequently asked questions
What moves in Ua-perm?
Three last-layer edges cycle while all corners remain permuted correctly.
Should I use the RU or M-slice algorithm?
Time both. Choose the one with the strongest average, accuracy and ending grip.
How do I tell Ua from Ub?
Determine the required direction of the three-edge cycle using center color order.
Put recognition under pressure
Mix this case into a real training session.
Use SupaKewber's algorithm trainers and smart-cube solve analysis to see whether isolated execution transfers into full solves.
Open the trainer