Interlocked is a three-dimensional brain teaser
Interlocked takes that spirit and turns it into a beautiful Flash game. It's a good thing the soundtrack is soothing, because the game itself can get pretty frustrating.
At the start of each level, you're presented with a box built out of blocks in different colors. You can click and drag the mouse to rotate the box any which way. Once you decide you want to shift a part of the box, hit SPACE to switch into "move" mode. You can then click any part of the box and drag it. Of course, you can only move a part as long as nothing is in its way. So it becomes a matter of understanding how the box is built, and what parts you need to move around so you could eventually take the box apart.
It's a tricky, difficult game, but it's a great brain teaser -- and definitely a keeper.