3x3 ZBLL U 27 algorithm

Solve the entire last layer in one sequence when its edges are already oriented.

ZBLL U 27 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: F F F; R: R B L; B: U R U; L: R L L. The letters identify colors by their reference faces.

Execute the algorithm

y' F2 R U' R' U' R U R' F' R U R' U' R' F R F2

The opening is y' F2 R; the final segment is F R F2. This version contains 17 face, wide, or slice turns and 1 whole-puzzle rotation.