3x3 COLL U 3 algorithm

Solve the last-layer corners with the last-layer edges already oriented; edge permutation may remain.

U 3 belongs to the U group in COLL.

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 upper corner stickers left to right when facing that side gives F: L F; R: R F; B: U U; L: R B. The letters identify colors by their reference faces.

Execute the algorithm

y2 R2 D R' U2 R D' R' U2 R'

The opening is y2 R2 D; the final segment is R' U2 R'. This version contains 9 face, wide, or slice turns and 1 whole-puzzle rotation.