Here are the boosts in the game and how they work:
Boosts you can choose before starting a level:
Money Maker - Doubles your profits
Flash Fry - Cuts cooking time in half
Teflon - Prevents food from burning
In-game boosts:
Lollipop - resets the timer of a customer with the least patience
Happy Hour - freezes the clock of all customers for 10 seconds
Groceries - instantly serves all customers
Add 30 seconds - adds 30 seconds to a level
Add 3 customers - adds 3 customers to a level
