Your job is to put the books in call number order
To start a new game, choose a level
Level 1 is the easiest and level 3 is the hardest.
Once you choose a level, your books will appear on the shelf.
Click on a book with your mouse (or your finger on a touch device) and hold down while dragging it into the correct order.
When you think your books are in the correct order, click the Check My Shelf button at the top of the screen to see if you are right.