3x3 · COLL
3x3 COLL S 4 algorithm
3x3 COLL S 4 algorithm: 13 turns, opening with y' R U. Case recognition, the complete sequence, and practical execution notes.
Solve the last-layer corners with the last-layer edges already oriented; edge permutation may remain.
S 4 belongs to the Sune group in COLL.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: 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: F U; R: B U; B: F U; L: R L. The letters identify colors by their reference faces.
Execute the algorithm
y' R U R' U R U' R D R' U' R D' R2
The opening is y' R U; the final segment is R D' R2. This version contains 13 face, wide, or slice turns and 1 whole-puzzle rotation.