Math Playground Order of Operations 

Funbrain Order of Operations 

XP Math - Order of Operations 

​Order of Operations - Softschools 
http://www.softschools.com/math/order_of_operations/games/

Math Frog
http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/order.shtml

Calculator Chaos
http://www.mathplayground.com/calculator_chaos.html
Mystery Picture
http://www.dositey.com/2008/math/m/mystery2AD.htm

Rags to Riches
http://www.quia.com/rr/318099.html

Order of Operations Blaster Game
https://www.mangahigh.com/en-us/games/bidmasblaster