It can be up & down, it's not the games fault, it's mine when I get frustrated with myself. There's one thing you could improve, stop forcing upgrades because sometimes (I'm an example) not everyone has good phones with plenty of MB's available, therefore something else on my phone had to be sacrificed. Having said that if the only app available was my Banking App I would of deleted this game. Just food for thought, in case anybody actually reads these. I would love a better phone.