Offset Cube looks like a squashed 2x2x7 puzzle, shaped to a cube. However, the axes of the inner 1x2x2 have an offset by half of the width of a piece. Because of this, pieces can change layer while playing the puzzle. This makes the puzzle harder to solve.
Please order a 3D-printed do-it-yourself puzzle kit from Shapeways at this page (check with Oskar about screws and stickers), or contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.