Looks very similar to Blockout from 1989: <a href="http://en.wikipedia.org/wiki/Blockout" rel="nofollow">http://en.wikipedia.org/wiki/Blockout</a><p>In Blockout, you had a transparent falling block so you could see what was below.
The tutorial would be great. It might also be a good opportunity to fix some bugs in the collision detection. I had a block disappear into other blocks that were 3 or 4 layers high. I could hear it keep falling and it finally hit the floor, which was interesting because there were several other blocks it had was passing through in those layers.<p>This was done without continual "wild" rotation. I was trying to complete a rotation immediately before it passed into the first levels of blocks, but then just observed once the block disappeared.