Anyone know the milkshake flavors or are they made of any ice cream flavor? Also, what's the difference between a regular and deluxe?

Any flavor can be made into a milkshake. The delux versions have extra toppings on them.

Any flavor can be turned into a milkshake. The deluxe milkshakes have extra toppings, such as whole cookies and brownies.

I know that you can make any flavor a milkshake. I dont know the difference between the shakes. Sorry