Step 1:

Find a flat area

Step 2:

Make a three by three one block down area

Step 3:

And another block down

Step 4:

Three blocks from the top and you are good to go Wait a while away from the trap and come back there might be a supersize
This wont work on PC version tho....i suggest adding water channels. Using water you can create a whole network of those holes and possibly add a mob grinder. Thankfully, PE zombies arent very smart.
Sorry I will fix it
The hole looks like it is 3 by 3 not 9 by 9

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More by bubblegum2003:Underground Tree House Food/zombie Trap 
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