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Falling Marbles - 3D puzzles involving a cube and 26 balls only
Logic Cube with Balls (Falling Marbles) is a puzzle based on a 1992 Romanian patent and is a very simple but challenging mechanical puzzle.
The main idea of the puzzle is to have a transparent cube or any other regular polyhedron filled with a number of moving pieces, balls or cubes (27 balls, for example). If we consider only 26 balls in a transparent cube, there is an empty space (the place of the missing ball), which makes it possible to move the balls by rotating the puzzle.
There are three key parts: the transparent case, the central piece and the moving pieces. The balls are coloured as in the image and could be numbered accordingly. The central piece inside the case will form, together with the case walls, some ducts in which the moving pieces can be ordered in a logical manner (by colour or by printed numbers).
The target is to rearrange the scrambled balls by colours (it is easier), or by printed numbers (it is much more difficult).