مدى السرعة التي يمكنك وضع الرقم في أمر قبل وقت يعود !!!
It is easy to put numbers in order. But trying to do that in a 60 secs while all the bad moves cost you 1 sec. That where the challenge starts.
Try to get highest level and share it with your friends.
If you think you are not good at it, try normal mode to improve your skills.