If you have an hour to kill

If you have an hour to kill and you want to work on your spacial awareness, check out this puzzle game from the Het Freudenthal Institute for Science and Mathematics Education.

You are presented with the view of a structure from three angles: top-down, front view (the arrow points at the front), and the view from the right-hand side. Your goal is to build the structure shown using the least number of blocks.

And just a hint - there's no gravity in this game, so feel free to make some flying boxes.

It's not particularly hard, but like I said, it's a good way to kill a little time. (edit: on second thought, level 2 is a bit tricky)

No, this is not the solution to the first puzzle...