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Rw U' R' U R' F R F' Rw' 4. Step 3: Solve as 3×3 Now treat each paired edge as a single 3×3 edge, each 2×2 center as one center. Solve using normal 3×3 method. 5. Step 4: Fix Parity Errors (Unique to 4×4) Parity 1 – OLL Parity (Single edge flipped) Symptom: One edge piece flipped during OLL (impossible on 3×3). Formula: Rw U2 x Rw U2 Rw U2 Rw' U2 Lw U2 Rw' U2 Rw U2 Rw' U2 Rw'
(Or shorter version) r' U2 l F2 l' F2 r2 U2 r U2 r' U2 F2 r2 F2 Symptom: Last layer has two swapped edges (e.g., opposite edges need swapping). Formula: r2 U2 r2 Uw2 r2 u2