Imposible Super Math Game

First one of choices is playing single. You have to answer all question true in 20 seconds. Your time will increase belong to your level and game difficulty. If you give one mistake, you start at Level 1!

Secondly, you can play with your friend at same time and same phone. If you want to beat him, you should be as faster as possible.

Do it your best and fight your friends! Prove who is more intelligent.