Let's organize tasks into difficulty columns, click on "This is a Normal Task" and drag it to the "Normal" column

Next Click on "Hard Task" and move it over to the "Hard" column

Once sorted you can perform edits and operations. Click on "Another Hard Task"

Bear in mind editing these content card entries (in this example tasks), will also update the original tasks back in your tasks list, cards, table and calendar views

After saving, you will see that Another Hard Task has updated to 100% complete. There are other operations that can be done here such as sorting cards in columns, cloning cards and create new cards.

Try out and see how it all works first hand.

DayViewer - Kanban System Using Boards