Minecraft – do to secure the towns/castles/hovels from climbing spiders

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So with the latest patch spiders can climb walls. What can we do to secure our towns/castles/hovels against these new mobile menaces? Does adding a lip to the wall work? Or is there some block they won't climb?

Best Answer

This answer has gone through many, many edits, so I decided to overhaul it. (Minecraft Forums user Thescorpi0on did a number of tests on this.)

Things that will stop spiders:

  • A lip extending off of your wall
  • Ladders on the top of your wall

Things that won't stop spiders:

  • Torches
  • Signs
  • Cacti (it will injure them but they can climb up them)
  • Glass
  • Sandstone
  • Ladders going all the way up your wall (they will start climbing at the bottom all the way up)
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