Minecraft traps

This is a multiplayer trap. It is best used as a security door to a stronghold or a base.

Materials: obsidian,
2 lever,
redstone wire,
piston,
sand,
2 iron doors,
pressure plate,
1 or more friends,
and glass.

First, make a hallway with only one block in width. Place a pressure plate at some point on the ground. Place one of the iron doors in front of it. So, if someone stepped on the pressure plate, the iron door will open. One block away, place another iron door. Before you do this, have a friend be on the other side. Place a lever beside the door on the side your not on. You should be in a block gap. Both doors should be operable from the other side. Now, remove the roof of the one block section, between the two iron doors. Remove more one block from the hole in the roof. Place a piston in the new gap. Wire it up to a place near the iron door and place a lever at the end. Now, pick a side of the iron door and remove two blocks from it. Now fill it up with glass. You should now be able to see the person in the one block place between two iron doors. Close the piston and fill the space above it with sand. Stand in the other iron door with the two levers. When something comes through you can pull the lever to open the door or drop sand on them. Have someone in the area with two levers at all times to guard your base.

This is the side with two levers/ the safe side.Me looking through the window at the one block space.
Me in the one block space looking up at the piston with sand on top. There at iron doors on both sides of me. I opened one of them.