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A mass-produced 2x2x4 cuboid.
This 2x2x4 tower is an official Rubik's product sold in Japan. You can buy it from Mefferts (although not anymore), the tribox.jp store, or PuzzleMaster (located in Canada). It is fully functional and can change its shape. Solving the middle is just like solving a 2x2x2, but the outer caps provide an extra challenge.
Mass production started in 2010
If you're looking to buy, eBay is the one place you can find almost anything... if you're willing to wait for it, then pay the price!
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