Here's the resource I've used that I've liked best. It's more the math, but thinking this way helped me with other puzzles: https://math.berkeley.edu/~hutching

Here's the resource I've used that I've liked best. It's more the math, but thinking this way helped me with other puzzles: https://math.berkeley.edu/~hutching/rubik.pdf https://math.berkeley.edu/~hutching/rubik.pdf