Once all 6 centers and 12 dedges are paired, your 4x4 is officially "reduced" to a standard 3x3! Solve it using the normal 3x3 Layer-by-Layer method. However, because even-layered cubes lack a fixed physical core, two unique parity errors may appear:

Need a reminder for the 3x3 solve steps?Open 3x3 Beginner Guide →四阶单棱翻转特殊情况（OLL Parity）：📋 CopyOLL 特殊情况（单棱翻转）三阶不可能出现单棱翻转，四阶有50%概率遇到。使用公式修复：

Rw2 B2 U2 Lw U2 Rw' U2 Rw U2 F2 Rw F2 Lw' B2 Rw2* Wide moves (Rw, Lw) turn two outer layers together.

四阶对棱互换特殊情况（PLL Parity）：📋 CopyPLL 特殊情况（对棱对调）角块对齐后若剩两对对棱需互换，将其置于前方与后方并执行公式：

r2 U2 r2 Uw2 r2 Uw2* Lowercase r turns inner slice only. Lowercase Uw turns top two layers together.