Red Line (Tetris)

The red line was probably the easiest to make.

Take two longish boxes and tape them together so that they make a longish vertical shape. Then with the top on, paint two squares per box so that you end up with four squares going down the length of the box.

You also have to cut part of the box tops off and tape them together so you get a lid, but that’s pretty easy to work out.

As of time of writing, this is the only piece that’s still available.