The movements used are not only linear movements and can include rotations, which makes the puzzle pretty difficult.
Even if you do not need a lot of steps to solve the puzzle, as the pieces are precisely cut, you may think that it's impossible. But when you go slow and do not use any force, you notice that you can make some moves which appeared as impossible at the beginning.
As you understand, you're not allowed to lift some pieces and everything has to remain flat!
There were additional challenges, but if you solve this one and understand the principle, then the other challenges are easy.
I like a lot the design of this puzzle. Which ones from the Jam series do you prefer?