User blog comment:Tal Puhov/Mob spawner/@comment-1389964-20120118192246

Jellyfish: http://terraria.wikia.com/wiki/Jellyfish_Statue Crab: http://terraria.wikia.com/wiki/Crab_Statue An example of wire, lever and traps usage: http://terraria.wikia.com/wiki/Lever Just use statues instead of Dart traps. Enjoy.