The game has got a lot more difficult since they removed the daily diamond reward for logging in consistently, and the coin income from completed restaurants -- now the only way to get the diamonds which are essential for progression is by levelling up or gambling coins on the slot machine, and the coins available via the daily quests which have replaced the old bonus aren't enough to win with. I do enjoy the challenge of the quests, though. I've restarted the game from the first level...