The Inversion Puzzle I found from Puzzle Master is a variant of Peter’s Black Hole. Difference is that the cubes in Peter’s Black Hole are trapped in a frame in which there are 26 cubes. In the Inversion Puzzle there are three axis which keep the 19 cubes together.
The Inversion Puzzle will turn you upside down before you can turn it inside out. Each cube of the Inversion Puzzle consists of blue and red faces. By sliding one cube at a time, the player attempts to conceal the red faces while revealing the hidden blue face, ultimately changing INVERSION from one color to the other.
The Inversion Puzzle is available from Puzzle Master for approximately US$ 13 / Euro 10. Happy Puzzling!