In Minecraft, you can farm potatoes and wheat to make food. You can farm mushrooms for potions and trees for wood. Well, what if you wanted to farm arrows or string, or better yet, what if you wanted to farm XP? You can farm that plus many other things, all with a Mob Farm. Here are the steps to create a Mob Farm in Minecraft.
First, you will want to start by building the platform the mobs will land on and the device that will collect your resources. Place two double chests back to back, one block into the ground. Then place four hoppers on top of the chests. Finally, place a slab of your choice on top of each hopper.
Next, leaving a one-slab gap above our base, we will build a tower extending upwards by 22 Blocks. Make sure that this tower is hollowed out, with a 2x2 gap in the middle. This will be the chute where our mobs will fall down onto our platform.
On the top block of our chute tower, extend each of the two block sides outwards by eight more blocks, bringing the total to 9 blocks. This will make a plus-like shape. Then, build a two-block high wall on the 9th block of each arm of the plus. Finally, extend this wall around the rest of the edges of the plus shape until a two block high wall is on all sides.
Now, placing blocks at the top block of the two block high wall, connect the arms of the plus sign together to make it into a square. This square should be 20 blocks long on each side. On the outside block of this square, place another wall that is two blocks high.
Then, all you have to do is place trap doors on the top row of blocks inside the plus sign. Leave them folded down against the wall. Next, place water on the far ends of each arm of the plus sign. The water will flow in towards the 2x2 hole in the center.
Once the mobs start spawning, they will think that the folded-down trap door is a block they can walk on, then fall into the water. The water will then push them into the center hole and down the chute. Finally, don't forget to break all torches you may have placed inside the farm and cover the platform with a roof, leaving a two block high space for the mobs to spawn.
So there you go! That is how you build a Mob Farm in Minecraft. Assuming you got all of the blocks counts right when the mobs fall into the chute, they will fall 22 blocks down until they hit the base that we made. This will leave them with very little health, so you can easily finish them off and collect their XP while the hoppers collect what they dropped.
You can decorate this farm to look more appealing or build it underground. As long as the main structure stays the same, you will continue to Farm those Mobs!