3x3 ZBLL U 28 algorithm

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

ZBLL U 28 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: L F L; R: F L B; B: U R U; L: F B B. The letters identify colors by their reference faces.

Execute the algorithm

R2 B2 R' B2 R' U R U' L U' L' U R'

The opening is R2 B2 R'; the final segment is L' U R'. This version contains 13 face, wide, or slice turns and no whole-puzzle rotations.