Alright, Here's some tips to start off with...
On Level 1, everyone will order the same size pizza, the 1/4.
And as for the other levels, you would have to start memorizing... There is a great list someone has made about all of the sizes on the levels...
So always TRY and have the pizza ready, even before the customer pops up ,
if possible.
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ALSO , you can put multiple slices in the oven! Just in case someone didn't know...
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And if you didn't know how to upgrade Berry, ......
As of yet, I haven't needed to buy the Gold Shoes. Not really neccassary for me... yet? ???
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A 25 Dollar tip, is better than a 10 Dollar tip.

So you WANT to save time! !
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I will update this thread later with my method!!
---------- pixar girl added 117 Minutes and 26 Seconds later ----------
Two Methods that work for me, right now anyway.
Complete Level 1 : SKIP
Complete Level 2 : Upgrade to Blue Shoes
Complete Level 3 : Save Money
Complete Level 4 : Buy another Pizza Topper
Complete Level 5 : Buy another Dough Maker
Complete Level 6 : Save Money
Complete Level 7 : Buy another Oven
Complete Level 8 : Upgrade Oven
Complete Level 9 : Buy another Pizza Topper
Complete Level 10: ---
Complete Level 11: ---
SECOND METHOD
Complete Level 1 : SKIP
Complete Level 2 : Save Money
Complete Level 3 : Save Money
Complete Level 4 : Extra Pizza Topper
Complete Level 5 : Extra Dough Maker
Complete Level 6 : Get Blue Shoes & Gold Shoes
Complete Level 7 : Save Money
Complete Level 8 : New Oven & Dough Maker
Complete Level 9 : Save Money
Complete Level 10: ---
Complete Level 11: ---
I will continue playing, and see if these methods continue to work even longer....
