Superflip

Every corner and centre is solved, and every one of the 12 edges is flipped in its place.

It's famous because it was the first position proved to need 20 moves, and no position needs more. That's why 20 is called "God's number".

U R2 F B R B2 R U2 L B2 R U' D' R2 F R' L B2 U2 F2

U R2 F B R B2 R U2 L B2 R U' D' R2 F R' L B2 U2 F2

Superflip (20 moves)

Do it twice and you're back to solved. Flipping every edge twice puts them all back.

U R2 F B R B2 R U2 L B2 R U' D' R2 F R' L B2 U2 F2

Superflip twice = solved

Common mistakes

Expecting a pretty picture. It looks like a gentle scramble until you see that every edge is just flipped.