No need a computer, just pen, paper, scissors !
With this coding ressource, students will understand what a LOOP is and how to use it to reduce the amount of bricks or lines.
It's a great tool to help them see the loop and use it after on computer or with robots.
It would be better if students already know how to move on a grid.
This is a decoding process, you can check also for coding process : "coding loop " it's a free resource.
(Exists also in french)