But it is! Try stacking the red and dark blue colors up in order and pushing them with the light blue block.

I got stuck on 21, and that's enough for me for now. Good puzzle game!

21: 'think outside of the box' :P

Hah, nice tip. I was stuck on that one too...

Ooh, good tip, thanks!

Bring the red one down, then stack the dark blue in front, and push with light blue to the left.