A great game except for one detail... They take it upon themselves to send you challenges from other people. That's right, the owner of the account doesn't, but it looks like they do. And I know this to be true because I play with my dad all the time, in the same house. He doesn't know how to send challenges. But here is the kicker, if you ACCIDENTALLY except the challenge IN THE MIDDLE OF A GAME OF ALL TIMES there is no way to go back to they game you were just playing. I LOST 50000 COINS!!!!!!