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This was definitely the hardest level for me, but I was able to get Expert a couple of different ways after figuring out a few good "slowpoke" strategies, so I'll pass those along and maybe they'll help. I'm sure one of the faster people would have a method that gets even more points, but this one should take you to Expert.
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1. Completely ignore the dinosaur. You need the points you get from mopping up spills! And it's even better if you can get a chain of spills. So usually I wait to mop until after I've picked up all the orders, before passing out food, and again after I've picked up the checks and before seating the next round.

2. You need flowers every time.

3. You need to get high colour bonuses. I paid particular attention to the green seats. Remember that it's OK to sit a party of two at a table for four or a party of four at a table for six and get bonuses there.

4. For most rounds, I just sat 3 groups and used the podium a lot. This let me keep both the people in line and the people at the tables happy, as well as bumping up colour bonuses. The one exception was the very first round, when I sat the first 3 groups plus the first group of 6 cavemen (otherwise I would end up losing some cavemen group from the line at some point.)

5. Go ahead and use podium twice after clearing dishes and before seating the next round. This helps pump up hearts. My usual routine: give checks. Pick up dishes. Use podium. Mop. Put out flowers. Use podium twice. Then start seating.

6. You probably already know this one, but make sure you are only single-clicking when people are done eating, to pick up their money and leave the dirty dishes on the table. Get the money from all tables before going back and picking up the dishes from all tables. This gives you two chains.

7. If you're in the middle of a chain and a table calls for the mop, ignore them until the mop bubble goes away. Then you can go ahead and finish the chain you were working on. If it's a seniors group, they can take a long time so you may want to stand at the podium while you're waiting.

8. At the start of a round, use drinks and the podium in between chains. My usual routine is: seat everyone. Run back to the podium and pump hearts. Pick up orders. Run back to the podium and pump hearts. Give out drinks. Mop. Give out food. Run back to the podium and pump hearts. So I keep everyone pretty happy. This is much easier to do when there are only 3 or 4 groups seated.

That's pretty much it. If you can keep everyone at 4.5 hearts or higher when you pick up money, you're getting good colour bonuses, you're getting occasional mop bonuses, and you're getting chains of 3 for everything, you should be able to just make Expert.

Good luck!