this trap is a trap in minecraft that you have the mob walk on pressure plates and down a trapoor ino lava. simple, right?
Step 1: The Pit
make a 3 X 3 X 3 pit. simple, right?
Step 2: The Cover
cover as in: the top. so just make what you see below. simple, right?
Step 3: Lava
this is the last thing in the trap. just add lava. (if you don't have lava, use cactus! )