# Step Three: Last Four Centres (L4C)

In this step, you'll solve the remaining centres of the puzzle. This step breaks the intuitively intended system of the steps prior by introducing proper algorithms!

(hover for hidden faces)

If your Skewb has 0 unsolved centres (that is, all of your Skewb's centres are solved) proceed to Step Four by clicking here.

There are a total of

**six**cases for this step:

Three cases involve solving a cycle of three centres, and the other three cases solve four centres.

**Important:**Use

**y**rotations so that your Skewb's centres are being solved as the pictures denote.

__3 Unsolved Centres__(hover for hidden faces)

UR-L-D |
(F' R F R') y2 (F' R F R') (pure)R L R L' R' L'R' L' R' L R L*You can use the pure algorithm when the U case is in the E-layer (that is, if the D centre is solved). |

OaR-D-F |
(R F R' F') y' (F' R' F R)R x' (F' R F R') y2 (F' R F) R (pure)(F R F' R') y' (R' F' R F) |

ObR-F-D |
(F' R' F R) y (R F R' F')R y x' (F' R F R') y2 (F' R F R') L' x' (pure)R' F' R F y F R F' R' |

__4 Unsolved Centres__(hover for hidden faces)

HF-B, R-D |
(F' R F R')(F' R F R')*3 (pure)R L R L' R' B' L' B (pure) |

ZaF-R, B-D |
(R F R' F')*3 (pure)R L R' L' y F' R' y R F (pure) |

ZbF-D, R-B |
(F' R' F R)*3R' L' R L R y' R F' R' (pure) |