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  1. The mission impossible puzzle is one of the hardest packing puzzles we have in our collection. This packing puzzle takes it to another level with 25 identical Y-shaped pieces that you need to pack into a 5x5x5 cube using all the pieces.

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  2. The Super Burr mechanical puzzle is one of the hardest interlocking burr puzzles in our collection and out there in the puzzle world. The puzzle's design makes it almost impassable to solve, because of the "holes" in the interior of the puzzle body, unlike most other regular Burr puzzles, that have a solid body with no holes in the interior.

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  3. This beautiful and intriguing mechanical Ladder puzzle is one of the most challenging puzzles in our interlocking puzzles collection. This perfectly symmetrical multifaceted celestial structure is made out of 51 non-identical interlocking bar pieces.

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