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Upgrade house costs 2000 (tower menu), and there is also a extra menu on the right [1,2] more stuff. Charge grenades in barracs "equip". Save money, stay sharp, juggle between long and short range weapons and never sleep.
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BTW, if your gun isn't aiming well, you may want to consider that handguns are not very good at long range attack.
Each weapon has a specific range, and the crosshair size reflects it.
Under rating threshold (hideshow)
very hard but fun. if the reloading speed was faster or enemies moved slower, and they were bigger it wouldn't be as bad