Must Escape The Farm

Must Escape The Farm Instructions

I decided to visit my grandparents at farm, but they are not there and the barn is locked. There must be something wrong with this place! Help me find the truck's key and escape the farm!
Common Core State Standards
CCSS.Math.Practice.MP2 Reason abstractly and quantitatively.
CCSS.Math.Practice.MP7 Look for and make use of structure.