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Could be a psychological trick to make consumers think that they're buying an "improved" version.
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    Now with more Tetris!

    Sweet Jesus!
https://youtu.be/HhI_f2WtUOs?t=227
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Timeless classic, I knew what it was before clicking!
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Maybe it's as simple as for the people making the boxes, it didn't contain Tetris from the start. And when they got the license, in their head, it now did have Tetris.
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Most boxes don't contain anything from the start; you need to put the product in them before you sell them!
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As the article stated; they made the boxes before they had secured the license. I.e. the boxes were made before the content was ready.
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Or maybe there was some pre-release catalog listings/marketing that listed the games without Tetris?
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The latter sounds very plausible, it covers all bases.
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