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Here's a couple of 3D top-down ones:

Blockout: https://en.wikipedia.org/wiki/Blockout

Welltris: https://en.wikipedia.org/wiki/Welltris

I came here to mention Welltris too, which I was surprised wasn't mentioned in the 3D section as it was an official Tetris sequel by the original developer. There are lots of screenshots of it on different platforms (mostly 8-bit) here:

https://www.mobygames.com/game/welltris/screenshots

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