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im trying to make an xp farm and these cheeky cave spider dont want them to go where i want to. is there any block that they dont climb

Sorry can't help you with this one :/ Perhaps check the wiki?

spiders are a bit tricky to make xp farms with because of the simple fact that they can climb. There are ways to make xp grinders with spiders and i would highly recommend looking up some tutorials on youtube. I think that spiders can climb any solid block so any block that the player cant pass through. I would recommend using Ethos design () as i have used the same design and it has served me well.

the problem is im making a quad spider farm so its harder

Probably soul sand? I dont know.

Using Fences and Doors(preferably Iron) you can block them off and have a small space to hit them trough(between the fence and the door since they don't line up).

http://www.minecraftwiki.net/wiki/File:Cavespiderleveler.png

Im sure that you can figure it out and if you cant come up with a design for 4 spawners just use 2 of them