3x3 · ZBLL
3x3 ZBLL U 31 algorithm
3x3 ZBLL U 31 algorithm: 21 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 U 31 belongs to the U3 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 L R; R: B B F; B: U R U; L: B F F. The letters identify colors by their reference faces.
Execute the algorithm
y R' U R U R' F' R U R' U' R' F R2 U' R' U2 R U' R' U2 R
The opening is y R' U; the final segment is R' U2 R. This version contains 21 face, wide, or slice turns and 1 whole-puzzle rotation.