The cage of this puzzle has the appearance of a loose stack of wooden logs. Many openings exist, but there is only one central 'log' which slides inwards.
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The capacity of the space inside is 3x3x3. The challenge is to pack three hexacubes fully inside the pile.
29 moves including rotation are needed, 20 moves of which are for the last piece in.
There is a unique solution among 1.5K assemblies.
Needless to say that ingenuity and geometrical insight are needed to execute this extensive task.
