Well, badly developed game, devs drive players to forsake the game.. There's a fuel tank it need to be full enough to play battles, if it's not, then you can't play unless you fill it with some gems if you have, if you not then you need to wait couple of hours to play again or pay to buy gems so you can fill the tank to play.. You'll enjoy the first day when it's free to fill, then you feel like you don't play too much, the tank become empty quickly, only couple of battles, that's $uck$ devs!