The navigation tree allows you to choose one of several subchapters (helminth 1 or protozoa) and then you further select “stool” or “blood”. The next step is to select an unknown slide under “images”. Here you get not only the virtual slide but also a multiple-choice question with four possible answers. If you click on an answer you get a detailed image of the selected parasite and you can compare it with the parasite you see on the slide. Before you “check” for the right answer, you have more trials. If you click “check” you get the answer and the comment whether your diagnosis is right or wrong.