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I've tried building a mob spawner in my house. It's on cobblestone, completely made of cobblestone, 2x2 tunnel width and a 32x32 at the top, 5 blocks high, completely dark. Nothing spawns up there though. How can I get it to work?

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    What's with the tags, dude? Minecraft doesn't involve Dwarf Fortress OR TF2. – Frank Aug 6 '13 at 1:45
  • What's with the title, dude? – user28379 Aug 6 '13 at 1:58
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    We have almost no way to diagnose the problem from just that information. Can you take screenshots? Preferably at least one from a distance showing the whole construction. In particular, how high is the dark room floor above your house's floor? – SevenSidedDie Aug 6 '13 at 7:40
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It could just be bad luck. Your area has the same chance to spawn mobs as every dark 32x32 section of the ground (if it is night) or cave. To compound this, there is a spawn cap of around 80 hostile mobs, so if they already exist in caves or outside, no new ones will spawn anywhere until the amount is under that limit.

To deal with this, light up your caves and surface as best as you can within 128 blocks from your grinder to keep the amount of mobs outside to a minimum. You can also increase the amount of spawn space available by building a few more floors for your grinder.

Also, make sure that you are not playing on peaceful difficulty.

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You need to be within 16 blocks of the spawner to activate it.

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  • Not a spawner block. The OP is attempting to construct a dark room mob spawner. – SevenSidedDie Aug 6 '13 at 7:38
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It can be bacause you have torches nearby wich make spawning impossible.

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    He says it's completely dark inside, so light couldn't be an issue. Having torches outside couldn't hurt. – Ullallulloo Aug 6 '13 at 22:20

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