I have beaten every level of every restaurant with 5 stars. I then started going for serving all customers. The ONLY levels I'm not even getting that close is Chateau Creep levels 13-15. I've tried all the combinations of VIPs. I've been trying for at least a month. It seems I could serve all customers if I open another kitchen slot. I already have 2! A third one for 300 GOLD. ARE U KIDDING ME. I've spent way more money than I want to admit. And let me say this, even Vegas lets you win at some point. I'm going back to Gamehouse games. At least their Delicious series is a one time purchase and very fun.