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Of all the Boxhead series this is my absolute favorite, and one I come back to from time to time for its arcade-style gameplay. The newest ones have more monsters and weapons, sure, but I don't get awesome until-death upgrades on my weapons for taking out a load of enemies quickly.
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easy to do it. just put walls by the one entrance, move to the other and spam grenades. pick up the boxes that dead drop carefuly (if you don't have many granades left) and continue untill you're at 42 lvl
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this should help you, when you get a frcken croud of zombies... just throw all of your grenades everywhere and kill them all, also you should get a great combo ;0