I dont remember exactly what lvl 10 for the 4th diner is but trust me if you just keep doing the seating arrangement like I said you should be able to pass it with no problems...Seat 3-4 tables stand at the podium and keep everyone happy until everyone is done eating then pass out all the tickets then clear all the tables seperately.....Are you having trouble reaching the goal or too many people leaving??? I can help you more if you can explain exactly what lvl 10 is since I cant remember
if the customers wants the snacks and yet people standing in line are unhappy make the people standing in line happy then if you have time serve the snacks if you dont make it in time to serve the snacks no big deal....just give me more details on what the lvl is like or I can play it again and find out lol