Importantly, you must protect the gate and prevent zombies escape. in the game there are 6 types of weapons and 6 upgrades for each and 3 types of upgrades for tractor: life, armor and speed. you can find it in the shop. in the game there are 6 large levels with different number of gates that must be protected and a swarm of zombies. you can kill bosses and cannons and get good money for it. beware of fat zombie, don't allow him to a tractor. to get a double points you must press the usual zombie by a tractor. good luck!
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