I play on a server with a few buddies and we have set up a few mob traps that work pretty well. Mine is a combo of a skeleton dungeon and a room with 4 8x8 spawning pads. I get tons of arrows and I put a glass ceiling in so I can lead the spiders to the lava. I don't get as many creeper spawns as I would like but I still get enough for quite a bit of gun powder.
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