Divs are displayed with float: left;. The goal is to make a rectangle with them. In order to do that, you can swap two blocks until the goal is reached.

The creation of the puzzle and the presentation of the divs has been implemented. The rest is up to you.

Decide together which and how many of the stories to implement.

• the user wants to choose between Easy (n=5), Normal (n=7) and Hard (n=10); this is a requirement
• the user prefers not to get a solved puzzle; this is not a requirement.