It seems that this puzzle has many, many different names, it has been around for long time and has been found in many different countries. You can read more about the history of this great puzzle on Wikipedia (https://en.wikipedia.org/wiki/Klotski)

 

The goal is to move the big red square tile down to the exit position. In the wooden version (or 3D printed at Archimedes) the red tile is thinner than other tiles which makes it able to slide through the exit "door" of the same height. To move the tiles, you need to "grab" a tile with the mouse and drag it towards the empty space. The tiles position automatically to the correct place.

 

Good luck. Please let us know if you manage to solve it. And also, feel free to report bugs.