Hard Badge: Day 1: Max Engine, Max Tranny, Max Tires, Get as much gas as you can. (IMPORTANT HINT: When going up the long hills with zombies, make sure you tilt your car back t afford to carry a zombie halfway up the hill on your hood!)
Day 2 - Max Gas, Spend the rest of your money on Boost. Use your boost near the end, when you are about to run out of gas, for extra distance.
Day 3 - Max Boost, put the rest in Gun. Use your boost on the last hill to jump it and fly into the crates and past 1000 feet.
Just a small thing, but it would be nice to see how much the next upgrade changes the thing by. For example, Health of ground coils 3 increases it the health by 107%, but I can't for the life of me remember how much of an increase that is over rank 2.
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 "Tesla Defense"){kind=icon}