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Looks very similar to Blockout from 1989: http://en.wikipedia.org/wiki/Blockout

In Blockout, you had a transparent falling block so you could see what was below.

also the rotations were animated

It's inspired by Blockout. There is a lot to improve, but there is a little potential in such game. I was rather considering turning it into a tutorial, it's around 500 lines of code and may be a good, simple introduction to WebGL games. Would you like to read such thing?

Yes.

The submission is dead now, but just in case ;)

http://www.smashinglabs.pl/3d-tetris-with-three-js-tutorial-...

Part 2 is also online and part 3 is ready to be released on Monday,

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