The Mf8 Crazy 2x2 Plus series offers variations of the same puzzle. Each version allows the centerpiece to rotate on specific sides which creates more or less of a challenge. The logo sticker on the white face features different colors -- if there is a "1" inside of the color, this means that face has a center that can be rotated.

The 000 version allows the rotation of the green, red, and white centerpieces.