3x3 · ZBLL
3x3 ZBLL T 20 algorithm
3x3 ZBLL T 20 algorithm: 13 turns, opening with y' R U. Case recognition, the complete sequence, and practical execution notes.
Solve the entire last layer in one sequence when its edges are already oriented.
ZBLL T 20 belongs to the T2 group in ZBLL.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: UFR, UFL. Upper edges with that color facing up: UF, UL, UB, UR. Reading each side’s top row left to right when facing that side gives F: R B B; R: L R U; B: L F B; L: U L F. The letters identify colors by their reference faces.
Execute the algorithm
y' R U R' U' R U' R' L U' R U R' L'
The opening is y' R U; the final segment is U R' L'. This version contains 13 face, wide, or slice turns and 1 whole-puzzle rotation.