Minecraft wiki entry for Creeper_farming, associated text: You can make a creeper farm by placing a spawning platform in an ocean to maximize spawning rates. Make a 2 block wall and the roof has to be trapdoors. Place cats in boats in the end of the farm to scare the creepers away and it will direct the creepers to the other end in which you will have a water stream guiding the creepers to a kill mechanism which can be manual, with campfires, magma blocks....