4x4 | Parity Algorithms Cases: 24x4 parity occurs on the last layer of a 4x4, where you get a case that is impossible to get on a 3x3 so you need a specific algorithm to solve it. PLL Parity2 R' U R U' r2 U2 r2 Uw2 r2 u2 U R' U' R PLL Parity1 r2, U2, r2, Uw2, r2, u2