We design optimized algorithms to solve the $n \times n \times n$ Rubik's Cube within $30.5 n^2 / \lg n + o(n^2 / \lg n)$ moves. This upper bound is asymptotically within a factor of $2.37$ of the known lower bound, which applies to almost all instances. The constant $30.5$ is also the first explicit constant factor for the known upper bound of $O(n^2 / \lg n)$, where the implicit constant of the previous algorithm was $1.01 \cdot 10^{40}$ (ten duodecillion). Thus we improve the upper-bound constant by a factor of more than $3.30 \cdot 10^{38}$ (330 undecillion). Our algorithm runs in time linear in the input size $N = Θ(n^2)$, and uses $O(\sqrt{N} \lg N)$ extra space (beyond the state of the cube). Our implementation is the first practical cube solver to generate solutions of length $O(n^2/\lg n)$. Our latest solver outperforms existing solvers for $n$ as small as $840$.

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