Not strictly Java (sorry), but VRML combined with JavaScript, so I hope thats ok.
3D tetris, and 3D look tetris. 3D Look tetris, is just normal tetris using 3d pieces. 3D tetris is where the pieces can be moved in all dimensions. And instead of winning lines, u need to win layers. I didnt bother with full 3d rotation and i didnt have time.
It’s for my Virtual Reality course at university.
Anyway here’s the link
Appreciate all feedback and stuff 
No offense, but “JavaScript” has absolutely nothing to do with Java. So this isn’t really the place for it.
Hmm, swpalmer is right, but I played it anyway. Suprisingly good performance for a giant multi-alpha blended cube thing.
Anyway, appears to be two issues right now.
Takes very very long to play. You can’t do a 10 by 10 grid on the bottom, it’s just too large. Try 6 by 6 or even 5 by 5.
If you let a peice get near the bottom and then click in one direction such that it pushes sideways against another set of blocks, it will run through the blocks and overlap. Obviously not working as intended.
And umm… keyboard support would be nice, plus you need some form of flip-backwards rotation (without this it’s just like 10 tetris boards stacked next to each other).
Hope I didn’t sound too negative; it looks pretty cool but you gotta look at some of the practical gameplay elements. Take advantage of the fact that it’s 3D, don’t just make it non-2D (also, going back to the keyboard thing, it’d be nice to be able to play it from any viewing angle).