The ReMarksPDF website now includes a Sandpit tab enabling download of sandpit files to help you experiment and learn how to use the database and moderation features of ReMarksPDF. The data set included contains 60 marked PDF files. Each of three markers has marked 20 files. One marker's marks are positively skewed, another negatively skewed, with the third marker having a bimodal distribution with clusters of high and low marks. These are typical examples of marking distributions suggesting moderation is necessary.