Hii, guys this is very good game for entertainment. It have good graphic.it works properly. This is multiplayer online or offline gamePositive effect: You will be very happy after playing, and you can also apply some physic theory in rhis game like projectile motion etc.Negative effect: it have hacked version also available on google so don’t use hacked version. It is very addict game , more time loss etc. So it is based on you that how will you maintain the time.ok Thanks