This cube, designed by Oskar, the Dutch Puzzle inventer.
The position of the piece trapped inside can be changed by it being moved in a unique way. However, the dilemma is… how you remove that piece?
When it was first invented, the start point at which the piece can be removed was not fixed. However, following a suggestion by the late Mr. Nob, the furthermost position was made to resemble a face, and a clear removal start point was thereby designated.
Hanayama Co. Ltd. 2005