Nothing requires, just press the answer as fastest as you can.
The easy game can be enjoyed by anyone, at some point, but you will find yourself pressing cell phone screen like creazy.
Are you ready now?
Go for a competition with world masters.

Ranking.
You can see the scores of players wordwide.
you can see the sores of best, today and this week as well as seeing scores of your country only.
Now, Give it a try!