2x2x2 DominoA 2x3x3 modified to look like a 2x2x2. It allows 90°-moves only on one of the axes, like the original puzzle it was made from.
2x2x2 Evil TwinA 3x3x3 consisting only of corners that block themselves in external bandaging.
2x2x2 Mirror half cubeA shape modification of a bandaged 2x2x2 in the shape of a triangular prism that can be solved by shape only.
Alek.SoSimplicity rules! This is probably the simplest but still working mechanism for a 2x2x2: Eight unconnected pieces in a cage.
Alternating CubeA 2x2x2 which allows only clockwise and counterclockwise turn alternatingly.
Asterix 2x2x2A 2x2x2 depicting comic characters from the french series "Asterix".