Copy the URL of this website from the top of this page,
download de Puffin Web Browser from AppStore/PlayStore,
open the Puffin Web Browser and paste the URL to return "here".
That 's all!

For the Quizzes: choose theatre mode in the menu
and activate the mouse arrow pointer (the menu now bottom right).
Drag the pointer to the object you want to drag.
Lift your finger, put it back and hold until a blue circle appears.
Now you can drag the object.