Solving mental puzzles can be a fun way to exercise your brain cells, as well as kill those idle moments when you’re at the office or waiting for the bus. If you often find yourself being bored on a particular subject like mathematics, chemistry or general knowledge, then consider yourself lucky, as applications these days are not just for mere fun and games. They are also here to help you achieve your goal in mastering those subjects and, at the same time, enjoy learning.

Test your knowledge in many different categories and sharpen your skills with some of the best quiz apps available on the Google Play Store. Here are some of the best quiz apps that will surely fire up your mental synapses.