HOW TO SET A TRAP.
First you must build a house it must have two doors a front one and a back one.Next you have to make some pressure plates and some trap doors. Lay the pressure plates down.Then you must dig a giant hole about 20 blocks down.After that you have to go mining for about 30 redstone and then go back up.Next lay the red stone down trapdoor to pressure plate.After that all you have to do is wait for other players and mobs to come.