errexi, if you actually read what your supposed to do then you will see that you have to destroy the blockades around the warmachine to be able to deploy vehicles.
2 more things: about the health packs, i dont know but maybe you have to buy another health pack to be able to use them (a glitch). And added to the turret gun, I think that zombies can't destroy the turret, but it disappears after a day.
Dammit! PirateNetRad ninja'd me! I just bought the turret gun and it happened to me so i tried reloading and i tried deploying a turret and it said "turret already deployed" so i figured that. But ya everyone, u hav to wait for the zombies to destroy ur turret before u can lay another one. You don't expect the game to let you deploy a turret in every square in the game, do you?
I'm confused, I lasted longer with no health and no upgrades against the second boss than I did with alot of upgrades and full health against the second boss.
The last achievement wont load. I've gotten past the level where if you press the "next level" button, it takes you back to level 1 (but you have all of your stuff still), and it didnt even say I got passed level 1 in the first place. No matter how many times I beat the levels again, it still wont count it.