In the rule “Storage Space”, add to the end of the second paragraph “The shed has a defence of 10.”
In the rule “Woodworking tools”, change the sentence “This increases the Defence Value of that square by 5” to “Fences increase the defence of any object on the same square as them by 4.”

In the rule “Planting”, change

Each type of Seed must have at least a Name, Initial, Sun Cost, and Shade Requirement.

to

Each type of Seed must have at least a Name, Initial, Sun Cost, Defense, and Shade Requirement.

Add to the end of the first paragraph of the rule “planting”, “A seed may also have a Counterback Effect, which takes effect if a zombie destroys the crop.”

Set the Defence for all the Crops to 2, Except:
* Weed and Walnut and Watermelon to 3;
* Peas, Cabbage, Potato and Corn, to 4;
* Pumpkin to 5.