Simple, No Spawner, Creeper, Zombie, Skeleton, & Spider XP Farm MCinstructabuilds

Tutorial on how to make a simple, all in one, XP farm. Makes use of creepers, Zombies, Skeletons and Spiders, with No Spawner, and No Redstone. Hope you .
How to make an incredibly simple, zombie xp farm, without a MOB spawner. Hope you like it.
Have been researching and testing out spawner XP farms in my own survival world and have seemed to find a very efficient way to funnel out the mobs the .
The Simplest Spider XP Farm I can think of, no water, no crusher and no redstone. I hope you find this build useful :-) For Cave Spider Spawner: .