by FowThingies, published
A 3D labyrinth required a +/- 3mm marble. It's a (not very hard) labyrinth with holes. If a marble rolls in a hole, flip the labyrinth over :)
The mid part could be modified to create a different labyrinth.
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Print all parts,
Put them together and play!
Edit part 2 to create a new kind of 'level' (google sketchup file)