Minecraft Traps

This is a cactus trap. Target is mostly mobs.

Materials: any kind of blocks,
4 sand,
4 cacti,
water,
and ladders.

First, build a frame about 7 blocks long, 3 blocks wide and 3 blocks tall. Keep both ends open. One end is where the mobs go in so build that side one block up so water doesn't spill out. Now at the other end place sand blocks and cactus on top. 3 pieces in a triangle like pattern. The other piece in front of the middle piece of sand but 2 blocks away. Now, in front of middle piece that I referred to before, dig down how much you want. But keep in mind you will need ladders to get out. Now, a block away from the middle piece of sand, outside of the trap, dig down the same amount of blocks as you did before and dig two blocks forwards. You should hit the other hole. Add the ladders so you can go back up, add a torch in the hole if you want so creepers don't surprise you when you go down there. Once up, add the water at the starting end. Any mob inside will be dragged by the water and hit the cacti and the water will bring the loot to the tunnel.

This is my tunnel to where I collect my loot.
This is a birds eye view of the trap. Left is my floating castle's garden. Right is my kennel. Top is another trap.