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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!
W,A,S,D to drive tractor. Mouse key to fire. 1-6 buttons to change weapon. R or Space bar to reload.