This is a pay to win game. I try to keep up with the upgrades but without either the coins or the diamonds it's impossible. I can only upgrade once in a play session and lose because of it. I have a full house and 3 customers waiting and lose because customers don't leave until the waiting customer is past mad. I've played this game 3 separate times and all 3 times I can't get past the first hotel without buying diamonds/coins. I like challenge, not impossible or pay to win.