SpeedcubeQuest

Settings

Cases in the trainer35 cases
Filter by learning status or group
Pattern hint
Answer buttons
Top colorTurn on several: each question picks one
Set length
Learning status
How often each case comes up

Factors

Higher means that factor pulls more of the practice toward it. Set everything to zero for a plain even shuffle.

60%

Favour cases you've marked Don't Know or Learning over ones in muscle memory.

60%

Favour cases you get wrong more often.

40%

Favour cases that take you longer to recognise.

Resulting chances

Probability each case is the next one shown.

U2.9%
J2.9%
J2.9%
F2.9%
Z2.9%
Z2.9%
H2.9%
U2.9%
T2.9%
R2.9%
A2.9%
Ga/c2.9%
R2.9%
Ga/c2.9%
Gb/d2.9%
A2.9%
Y2.9%
A2.9%
V2.9%
J2.9%
N2.9%
V2.9%
R2.9%
Gb/d2.9%
T2.9%
A2.9%
Ga/c2.9%
Gb/d2.9%
Y2.9%
F2.9%
R2.9%
Ga/c2.9%
V2.9%
Y2.9%
E2.9%
Sound

What is two-sided PLL recognition?

Two-sided PLL recognition means naming which of the 21 PLL cases you are looking at from only the two sides you can see, without rotating.

You scan for four patterns, in this order, and take the first you find:

  1. 1. 3-bar

  2. 2. Lights

  3. 3. 2-bar

  4. 4. Bookends

Within that group, the first case that matches is your answer. Color rules are relative, never absolute: "opp" means opposite and "adj" means adjacent, both relative to the nearest pattern color. Learn the shapes, not the colors - every case turns up in four color combinations and may be mirrored.

Pattern system from the two-sided recognition guide by Mark Rivers.

Cases

3-Bar

U - headlightsEasy
J - 2-bar (orange)Easy
J - 2-bar (blue)Easy
F - 4 colorsEasy

Double Lights

Z - 2-color 6-checkerEasy
Z - adj edges & 4 colorsEasy
H - opp edgesEasy
U - 2:1 pattern & 3 colorsEasy

Lights + 2-Bar

T - inside bar & 3 colorsEasy
R - inside bar & 4 colorsEasy
A - outer bar & 3 colorsMedium
Ga/c - outer bar & 4 colorMedium

Lone Lights

R - 5-checkerEasy
Ga/c - 4-checkerHard
Gb/d - lights enclose oppHard
A - lights enclose adj (but no checker)Medium

Double 2-Bar

Y - both outsideEasy
A - both inside & bookendsEasy
V - inside & no bookendsEasy
J - same side & bookendEasy
N - same side & no bookendEasy

Outside 2-Bar

V - no bookendMedium
R - adj appears twiceMedium
Gb/d - opp appears twiceHard
T - adj by bar & 4 colorsMedium
A - opp by bar & 4 colorsMedium

Inside 2-Bar

Ga/c - bookends adj colorHard
Gb/d - bookends opp colHard
Y - no bookendsEasy

Bookends No Bar

F - enclosed 4-checkerHard
R - adj appears twiceHard
Ga/c - opp appears twiceHard

No Bookends

V - inner 4-checkerHard
Y - outer 4-checkerMedium
E - 5-checker w/ opp middleHard

Statistics

Per-case recognition (average of last 10 attempts)

Answer some questions to see per-case stats.
Answer some questions to see which PLLs you mix up.

Frequently asked questions

Can every PLL case really be recognized from two sides?
Yes. Any two adjacent sides show six stickers, and that is always enough to pin down the case - the pattern hierarchy (3-bar, lights, 2-bar, bookends) plus the relative colors distinguishes all 21 PLLs at every angle. No cube rotation needed.
How do I get faster at PLL recognition?
Learn the patterns instead of memorizing color pictures - bars, lights and bookends stay the same across all four color combinations of a case. Then drill deliberately: the confusion matrix above shows exactly which case pairs you mix up, and raising their weight puts them in front of you more often.
Is this a PLL algorithm trainer?
No - this trainer is about naming the case fast, which is its own skill. For the algorithms themselves, ranked by how often top solvers actually use them, see the PLL algorithm database.
Do I need to know all 21 PLL algorithms first?
No. Recognition and algorithms can be learned side by side - use the case filters above to train only the cases you know so far. If you are still on 2-look PLL, recognizing corner permutation from two sides transfers directly once you go full PLL.