Defensive Tactics are a must if you wish to survive the zombie outbreak. As such, players are free to edit this page to add on any tactic they find in-game. If you are going to add a tactic, please make sure something like it is not already posted!
Build a tower of truss later in the game. You can shoot through it, so get a sniper rifle and go high up for max effectiveness. Once you build your overwatch tower make a bridge leading to a house, and fortify that house with iron blocks/truss metal doors, and you will be able to deter even the biggest zombie hordes.
This tactic is for those who are quick and trust their luck. First, loot whatever is around you. Second, get to a forest region. Next, gather all the wood you can before 15:00 hours. Then build a 5x5 base of planks raised off the ground with at least a three block gap and surround it with all the Wood Spikes if possible. This base can be used to stage raiding operations upon the settlements scattered around the landscape. You should travel around, making these small bases around as small outposts to help you get started. When you can, build a fortified base, since this tactic will not protect a player for long.
Once you have created yourself a stable home, one thing you need is a spot to see what is coming. Breaking the side of a roof or having a ladder to the roof will give you a great view. A good way to see well at night is to make rings of Torches to illuminate the space around your shelter.
Tunnelling is a slow strategy that requires a lot of preparation before it will work. Dig into the ground, at least three blocks deep, and then downwards on a slope, so that you can still get out and the ground above will not collapse on you. Underground bases are hard to find and breach.
There is also the option to build a small concrete structure with no doors on the bedrock with just enough height for safety and a good vantage point. Then fortify accordingly with spikes, a moat, etc. and use wooden frames to get over your wall and defences, The idea being that your spikes and moat will stop them from reaching your foundation, your structure will be tall enough to dispatch the zombies safely and you can dig and craft freely.
Land mines are great for defending at night against large hordes of zombies. They do area of effect damage, damaging both the zombie that steps on them, and the zombies around them. However, they can harm you too, and natural wildlife will constantly step on them and set them off, requiring a good minefield to need constant restocking. One land mine placement strategy involves making a 2-block-high fence around your base, and placing land mines spaced out 1 block away from the fence. Every once in a while, go out and check for breaches in your fence and repair them. The land mines will not instantly destroy your fence.
A water entry is a very safe method for having quick access in and out of your base. The main drawback is that you must build near water. In order to achieve the desired result, you must dig a channel into (or build) a 2 tall 1 wide hall with water 1 block deep. Once you have a sufficient length drop the channel down 1 block. This causes zombies to try to swim up while you can drop right into the hidden tunnel. However, you must be very careful with this, for crawlers can fit through it and try to sneak into your fort.
Barbed Wire seems to be the only impediment that zombies do not attempt to break down, even if they are enraged. Build a Barbed Fence Wire two to four blocks high surrounding your home base with a single doorway. It is recommended that you build a walkway surrounding the second floor of your house (if there isn't a second floor, build one) and build "parapets" or an upside-down L connecting to the block in front of you and the block above you to block incoming fire from Infected Police Officers and hostile players. The sniper rifle shoots through the barb wire and with some enclosing barb wire in front and above the walkway and in-between parapets, hornets are now harmless. The only spot zombies will attack is your doorway through the fence, which you must protect at all costs, as multiple hordes on high spawning levels can pile up quite a bit. Use pipe bombs (which don't break blocks but can eliminate entire swarms of zombies when used right) to break up amassing zombies at your gate. It is advisable to build a tower inside your enclosure that can see in front of your door if you want to keep your distance.
If zombies have sensed you, they will try to chase you and break into your house; while doing so, they will destroy a lot of your base.To prevent them from destroying your house, build some 6 block high tower platforms with a base of 2*2 around your house and bridge them together with bridges. You can also integrate your house with them and use your house as another tower platform. If you use wood to build them, make sure that they are close enough so that the bridges can hold your weight. Wood frames have a mass of 6 and a max load of 36.Also make sure that every tower platform including your house is surrounded by a one block overlap to prevent spider zombies from coming up on your platforms.When the 5th and 6th nights come, hordes of zombies will start to attack you and your house. Run along on the platform in a circle until day. Because they will chase you, they will run after you instead of destroying your house. At dawn they will slow down and you can easily kill them from above or flee from them, but watch out for dogs. Keep in mind that jumping from a 6 block tall elevation might break your legs, so put a small 2 block tall base on the ground where you can jump onto.Also make sure, that the door to your house isn't reachable by normal zombies. Because as soon as zombies find a door, they will keep trying to destroy it and won't stop, even if you run away. Use ladders to reach your door.The whole platform structure should have a outer diameter of about 25 blocks in every direction, so that running makes sense.
One additional note. During night, the only zombie you must really kill as early as possible are the screamer zombies, because they will spawn new enemies and more enemies means more trouble. So when running around on your platform make sure that you kill the screamer zombies. All other enemies can be killed in the day. If you do the running right, they won't be able to damage as much of your base. Your base, if build right, will withstand the night so long as you make sure that you stay on the platform and run to keep them busy.
Simply attach a 4 or 5 block long plank to the top of your wall, and dig a 3x3x3 or 4x4x4 pit directly underneath the end. Put wood log spikes at the bottom, and surround the pit with regular spikes. When day 7 comes, cover the door with something stupid, as long as it's a block, that way they ignore the door and go for YOU. Then just stand on the plank and snipe the cop zombies. The regular zombies will just pile up beneath you, unable to reach you, and die to the spikes. Make sure to have a repair tool with you, along with repair materials, and repair the plank throughout the fight. If a cop zombie manages to break even one of the blocks, you're gonna have a nice prickly date with your own spike trap. That is, if the mosh pit of zombies doesn't get you first.
This tactic is based off of utilizing the existing Large Barn, thus the name, here are the steps you need to take to not only successfully build this style of fort, but also dodge the pitfalls that I encountered trying to produce the end result:
Final Notes: This method is not without it's pitfalls (pun intended) but I have used this method successfully in maps where the zombie block damage was maxed out with very little mop up and repair as most of the zombies would fall in the pit and die (My pit by the end was at least forty blocks deep, of that, it was ten into the bedrock, didn't help that I was in a desert biome either.) In the end there would only be a few stragglers wandering around that you could simply hop off the roof of the barn and run away from if you were so inclined. The only time there was a catastrophic failure is when I didn't disassemble the roof on the barn correctly and the whole thing collapsed in on itself so consider that your final warning, disassemble the roof with the utmost care. Hello
You start with a platform of whatever type of frames you want, and build a 2-block wide walkway across the middle or side of the cave, about 4/5 of the way across the cave. then leave an empty space 2 blocks wide that you do a running jump across to enter your base. Your base will essentially be mounted on the opposite wall of the cave as the entrance from the tunnel to the surface. Line the bottom of the cave(about 10 blocks or so below your platform base) with wood spikes/log spikes. Any enemies that find their way down into your cave home will invariably attempt to get to you in your base, yet fall into the spike pit and crawl about until they succumb and die. you will almost never be able to safely loot them, but that is a small price to pay for safety.
Some caves even have their bottoms covered in water, so you always have a water source, without having to trek above ground. While I have yet to build a home in a water cave, and don't know how well the spikes will work under water, I suspect you might need to build a second platform over the water with spikes on top of it( leaving a small area to gather water from).
I suggest leaving an open area in your base, across from your walkway, that you can jump to (think of it as a front porch of sorts), and only THEN once you are on your homes platform, will you open your door... juuuust in case anything manages you make its way across to your base. I also suggest having a ladder and hatch to the roof of you base as an escape route or as access to your roof for a bit of target practice ;)
You can also set up multiple walls with a door in them as checkpoints in the tunnel from the surface and even a small building on the surface, built around the cave opening as your first line of defense( I find that this is a waste of resources though). You can also set a 5 block thick wall of spikes on the surface covering 99 percent of the ground around your cave opening as a way to cripple ANYTHING that tries to attack you or follow you into your tunnel. So far, the only Zeds that have made it into the tunnel, did so while crawling due to the spikes on the surface destroying their legs.. They then fell off my walkway and died on the spikes below.
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