Are you a detailed How about animals?
I can challenge the various issues related to animals in this app.
Because you might want to tweet or rank score (class), you can also publish and competition to everyone my grades.
If you are confident in the knowledge, if you are interested, please try it by all means the person you are trying to memorize now!
[Questions]
-Dog
-Cat
-Birds
-Fish
-Dinosaur
-Insects