Solve each 2×2 block first
Solve the centers
Pair up edge pieces
Reduce the 4×4 to a 3×3 state
Solve it like a 3×3
Fix any parity cases if they appear
Solve each 2×2 block first
Solve the centers
Pair up edge pieces
Reduce the 4×4 to a 3×3 state
Solve it like a 3×3
Fix any parity cases if they appear