Minecraft Traps

This trap is a lava trap.

Materials: lava,
water,
2 ladder,
and dirt.

The first thing is to make a platform that is five by four, the height is two. On one side make an opening that is two blocks wide. Don't fill the platform with blocks keep it open. On the bottom of the platform, place blocks to fill up the bottom layer of the platform. The first block nearest to the opening you should keep empty. Place ladders there. In front of the opening, build something eight by four by two. Once again keep it empty. Now, on the side farthest from the ladders, put water on the first block. At the side with water, destroy the two blocks so mobs can jump into the water. Now, on the side of the other platform farthest from the water, place the lava. The water should reach the ladders and not touch the lava. The mobs will walk into the water and flow into the lava because they float.

This is where you put the ladders. I used some other blocks because I ran out of dirt. I used soul sand because spiders can't climb this.
The correct placement of the fluids. The depths are different.